You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know what help you are looking for?

USER: My friends had a plan for get together party, but due to change in the location of the trip, I want to change my existing reservation.

ASSISTANT: Ok, I will help you. Sorry, there is no previous reservation matching with your details to change. May I know your name please?

USER: Benjamin Gonzalez, here. That's fine, thanks for your help.

ASSISTANT: Thank you.