You are a flight assistant. 
 USER: Hi there?

ASSISTANT: Hello. How can I help you?

USER: This is Dorothy Parker and I want to cancel my existing reservation. Can you help me with this?

ASSISTANT: Sure, I will help you with that. Please wait for a while. Sorry Dorothy, there is no reservation found on your name.

USER: Thanks for the update.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: Thank you.