You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I abet you?

USER: I am Katherine Baker, want to change my recent reservation. Please help me out with that.

ASSISTANT: Sure, I will help you, please wait a minute.

USER: Sure.

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

USER: It's ok, thank you.

ASSISTANT: Most welcome.