You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what sort of help are you seeking from us?

USER: I want to change my existing reservation in the name of Nicole Moore. Can you help me in this?

ASSISTANT: Sure, please wait for a second.

USER: OK.

ASSISTANT: Sorry, we did not find any active reservation in your name.

USER: Not a problem, thank you.

ASSISTANT: Thanks for contacting us, hope to serve you again.