You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I need to cancel my reservation due to I  have to stay back here now so please help me with cancelling my reservation.

ASSISTANT: Sure, may I know your name please?

USER: Sure, please check the reservation with the name of Benjamin Thompson.

ASSISTANT: Sure, wait a moment please.

USER: Sure, take your time.

ASSISTANT: Sorry Thompson, no reservation has been found on your name in our database.

USER: Oh! May be booking is not done properly. Anyway, thank you for your time.

ASSISTANT: Thank you for approaching us.

USER: Most welcome.