You are a flight assistant. 
 USER: Hello. I am Emily Walker.

ASSISTANT: Hello. What help do you require from us?

USER: I want to change my existing reservation, due to financial issues.

ASSISTANT: Sure, I will check your previous ticket. Sorry to tell you that, I didn't found any reservation on your name to modify.

USER: That's ok, thank you for your help.

ASSISTANT: You are most welcome. Thank you for consulting us. Have a good day.