You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I would like to cancel my reservation which I have done to give presentation in WTO but unfortunately it got cancelled. So, can you please help me with cancelling the reservation?

ASSISTANT: Ok, please provide your name so that I can help you easily.

USER: Sure, please check with then name of Charles Davis.

ASSISTANT: Sure, please wait a moment I revert you.

USER: Sure, take your time.

ASSISTANT: Actually, there is no reservation found on your name.

USER: Oh! May be booking is not done properly. Anyway, thank you for your time.

ASSISTANT: It's ok, thank you for reaching us.

USER: Most welcome.