You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Due to some emergency I need to cancel my reservation can you help me in cancelling my reservation?

ASSISTANT: Sure, may I know your name?

USER: I am Mark Williams.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found in your name.

USER: No problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you for the information.