You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what help can I do for you?

USER: I want your help in cancelling my recent reservation as I am not able to catch flight according to my pre-planned timings.

ASSISTANT: Sure, may I know your name please?

USER: My name is Sandra Williams.

ASSISTANT: Sorry, there is no previous reservation found on your name to cancel.

USER: It's ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for the information.