You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Ronald Hill. I want to change an existing reservation, due to my cousin wedding got postponed.

ASSISTANT: Sure.

USER: Could you help me in changing the existing reservation?

ASSISTANT: Sure. Please wait a while.

USER: Sure.

ASSISTANT: Thanks for your time. We didnt found any reservation by this name.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for choosing us.