You are a flight assistant. 
 USER: Hello. I'm Jeffrey Gonzalez.

ASSISTANT: Hello, how may I help you Jeffrey.

USER: I had planned to go on a vacation, but it was postponed.Can you change my existing reservation?

ASSISTANT: Sure, I am here for helping. Please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your patience, sorry Jeffrey, there is ticket booking found on your name. Sorry for the inconvenience, there is no reservation found on your name.

USER: That's Ok. Thank you for your help.

ASSISTANT: Thank you for calling us.