You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Pamela Thomas, can you help me in changing my reservation?

ASSISTANT: Sure, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry Thomas, there is no reservation found with your name.

USER: That's fine. Thank you so much for checking.

ASSISTANT: You are welcome.