You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Christopher Harris, want to cancel my recent reservation due to some personal issue. Please help me out with that.

ASSISTANT: Sure, will you please give me a moment?

USER: Sure, take your time.

ASSISTANT: Thanks for waiting, there is no reservation found under your name.

USER: It's ok, thank you for your help.

ASSISTANT: Welcome, have a great day.