Interview questions about triggers of users behaviour

We are conducting user interviews with some of our existing customers that use our travel app to book their trips. One thing we are exploring during these interviews is what kind of information or media might trigger a need to travel among customers.

At the moment we have phrased a question, as something like this

"Do you recall any information or media that may have triggered a need that inspired you to make travel plans"

it's still early but from the few responses, seems we are not getting the answers we are looking for. I'm wondering if we are asking the right questions, or as these mental triggers are unconscious, would they be even able to recall this.

How could ask a better question to understand what triggers a need for our customers to travel?