You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Pamela Mitchell. I have some personal matters that need fixing so I need to change an existing reservation.Can you please help me?

ASSISTANT: Sure, please wait for a moment. Thanks for waiting, no reservation found on your name to change your reservation.

USER: That's not a problem. Thanks for your information.

ASSISTANT: Thanks for choosing us.