You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Joseph Wright.

ASSISTANT: How may I assist you?

USER: Due to an emergency, my trip is cancelled. Could you help me in cancelling the ticket?

ASSISTANT: Yes, sure. There are no reservations under your name.

USER: That's ok.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your help.