You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My name is Andrew Perez. Due to a sudden meeting, my trip is cancelled. Could you help me in cancelling the ticket?

ASSISTANT: Sure, please give me a minute.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found.

USER: That's ok.

ASSISTANT: Would you like to book a ticket on any other dates?

USER: No, thank you for your time.

ASSISTANT: Thank you, have a nice day.