You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to change an existing reservation. Can you please help me out?

ASSISTANT: Sure, would you please provide your name to check the details of your reservation?

USER: My name is Kathleen Campbell.

ASSISTANT: OK, please wait a moment.

USER: Sure.

ASSISTANT: Sorry for the inconvenience, no reservation found on your name.

USER: OK, thank you for your information.

ASSISTANT: You are welcome. Have a nice day!.