You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: My name is William Evans.

ASSISTANT: How may I assist you?

USER: Owing to emergency, I need to cancel my recent reservation. Please help me with that.

ASSISTANT: Sure, we are gleeful to help you.

USER: Thank you.

ASSISTANT: Please wait a moment. I will check your status and revert you.

USER: Ok.

ASSISTANT: Thanks for waiting, we did not find any active reservation on your name in our records.

USER: Nothing to worry. Thanks for letting me know.

ASSISTANT: Thank you for availing us.