You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How may I aid you today?

USER: I want to cancel my recent reservation which is with the name David Lopez as my conference got cancelled. Please help me with cancellation.

ASSISTANT: Sure, I will help you. Please give me a moment I will check and let you know.

USER: Ok, sure.

ASSISTANT: Thanks for waiting, unfortunately there is no reservation found by this name.

USER: That's fine, thank you for your help.

ASSISTANT: Thank you for opting us.