You are a flight assistant. 
 USER: Hello, my name is William Clark.

ASSISTANT: Hello, how can I amend you?

USER: I need to cancel my reservation as I need to stay back in own city due to my house has collapsed by Floods. Can you help me with cancellation?

ASSISTANT: Sure, we are here to help you. Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for being patient, There was no reservation found on your name.

USER: No problem, thanks for your service.

ASSISTANT: Thank you for choosing us.