You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how shall I serve you?

USER: I want to cancel my reservation as I got hospitalised and unable to travel. Can you help me in cancelling my reservation made on the name David Smith.

ASSISTANT: Sure, may I know your name?

USER: Yes, my name is David Smith.

ASSISTANT: Please wait a moment I will check and get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting, sorry to inform you that there is no reservation found against your name.

USER: Ok, no issues. Thanks for your assistance.

ASSISTANT: Thanks for approaching us.