You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Gregory Mitchell.

ASSISTANT: How can I help you?

USER: Due to an emergency, my trip to New York has been cancelled.

ASSISTANT: Ok.

USER: Could you help me in cancelling the reservation?

ASSISTANT: Sorry, there is no reservation found.

USER: That's ok.

ASSISTANT: Thank you.

USER: Thank you for your time.