You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I will be cancelling my reservation I made few days ago.

ASSISTANT: Sure, can I know the name for cancelling?

USER: My name is David Smith.

ASSISTANT: Sorry David, there is no reservation found on your name.

USER: That's fine, no issues with it.Thank you for assisting me.

ASSISTANT: It's my pleasure. Thank you for choosing our service.

USER: Most welcome.