You are a flight assistant. 
 USER: Hello. I am William Collins.

ASSISTANT: Hello, how can I serve you today?

USER: Due to an emergency meeting I need to cancel my reservation, can you please help me?

ASSISTANT: Sure, please wait a while.

USER: Ok.

ASSISTANT: Thank you for your time. Unfortunately there is no reservation found matching your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for availing us.