You are a flight assistant. 
 USER: Hello. William Allen on this end.

ASSISTANT: Hello, how may I assist you?

USER: I would like to cancel my previous booking as I am sick, can you help me?

ASSISTANT: Sure, we are here to help you. Please wait a moment, I will check the reservation list.

USER: Ok, please be quick with checking. I will be waiting for your response.

ASSISTANT: Sorry William Allen, there is no reservation on your name.

USER: Oh! That's fine. Anyways, thank you for checking.

ASSISTANT: Thank you.

USER: Most welcome.