You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Mark Wilson.

ASSISTANT: How may I assist you today? Nice to meet you Mark Wilson.

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

ASSISTANT: Sure, please wait for a minute.

USER: Sure.

ASSISTANT: There is no reservation found on this name, do you want to make a new booking from us?

USER: No, thank you.

ASSISTANT: It's my pleasure.