You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how exactly I can serve you the best today?

USER: I want to change my existing reservation as my trip got postponed. Can you please help?

ASSISTANT: Sure, I will help you. May I know your good name please?

USER: My name is Nicole King.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there is no reservation found in your name.

USER: No a problem. Thank you for you information.

ASSISTANT: Thank you for reaching us.