You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Patrick Evans here. I could not find the option of change reservation. Can you do this for me?

ASSISTANT: Sure, just hold on for a while, I will check your previous reservation status.

USER: Sure.

ASSISTANT: Sorry Evans, there is no reservation found with your name in our records.

USER: That's fine. Thank you for your information.

ASSISTANT: My pleasure.