You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My name is Frank Lopez. Due to a sudden meeting, my trip is cancelled. Could you help me in cancelling the reservation?

ASSISTANT: Sure, please give a minute. Sorry, there is no previous reservation done with your name.

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

ASSISTANT: Thank you, have a good day.