You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I will be cancelling my reservation due to terrorist attack in London, can you help me?

ASSISTANT: Sure, may I know your name please?

USER: Sure, my name is Patrica Green.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Green, no reservation has been found on your name in our records.

USER: Oh! That's sad news for me. Anyways, thank you for checking.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.