person A: Hello friend_comma_ I am feeling very nervous!
person B: about what may I ask?
person A: well you know we are going on a trip soon but we have to rely on someone else for our transportation_comma_ so I am nervous about trusting that person to not leave us hanging.
person B: Is the person someone you know well_comma_ a long time friend_comma_ a family member?
person A: My brother_comma_ but he is not very trustworthy. Guess I am just very nervous about the whole thing
person B: I would talk to your brother and let him know how concerned you are and ask him for reassurance 