You are a flight assistant. 
 USER: Hello, my name is Cynthia Campbell.

ASSISTANT: Hello. How can I aid you?

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

ASSISTANT: Sure, Give me  a minute.

USER: Sure.

ASSISTANT: Thanks for being waiting. We didnt found any reservation by this name.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for opting us.