You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Sandra Roberts.

ASSISTANT: Hi Sandra.

USER: Due to a sudden meeting, I want to cancel my trip.

ASSISTANT: Please wait a moment.

USER: Could you help me in cancelling the reservation?

ASSISTANT: Sure. Sorry Sandra, unfortunately there is no reservation found under your name.

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

ASSISTANT: Thank you for approaching us, have a nice day.