Using similar expressions, phrases and similes
A time-proven way to show someone you are in the same boat as them is to use their own expressions and phrases. Do not try to amaze them with jargon and words they do not understand: on the contrary, adopt their vocabulary for a while. You will thus show that the two of you are in fact of a kind, which will automatically gain their sympathy.
Using the same gestures
According to Psychology Today, mirroring of gestures is one of the simplest yet most effective tools for showing someone you are in the same boat. If the other person makes some hand movements when talking, do likewise. If they nod their head when they agree with what is being said, nod your head too. It sounds trivial but on the subconscious level this tool has a very powerful effect.
Repeating what the other person has said
Whenever the other person says or explains something, do not react immediately, but first sum up in your own words what they have just said. Not only will you thus ensure you have understood correctly but, most importantly, you will create a stronger bond with them.
Telling a similar story
To show you appreciate what the other person is going through on an emotional level, tell a story that is similar to their current situation. Ideally the story should be about you, and it should make the other person empathise with you and help them see you both have a lot in common.
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