You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Sharon Lee. I want to cancel my flight ticket due to some problems I am unable to travel in flight so can you please cancel my reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Ok, thank you for your positive response.

ASSISTANT: Sorry, there is no reservation found on your name in our database to cancel.

USER: Oh! It's ok no problem.

ASSISTANT: You are most welcome.

USER: Thank you for your information.