You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Christine Nelson.

ASSISTANT: How may I help you?

USER: I want to cancel my reservation, can you help in booking?

ASSISTANT: Sure, I will help you out. Please wait a moment.

USER: Sure.

ASSISTANT: Sorry there are no reservations found.

USER: That's ok. Thank you for your help.

ASSISTANT: Thank you for choosing us.