You are a flight assistant. 
 USER: Hello, my name is Sarah Taylor.

ASSISTANT: Hello, how may I help you today?

USER: I have some problems that need fixing, so I need to change an existing reservation.

ASSISTANT: Sure, Wait for a minute.

USER: Ok.

ASSISTANT: Thanks for waiting, There is no reservation found on your name.

USER: Not a problem, thank you.

ASSISTANT: Thank You.