You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Can you provide me your concern?

USER: Due to some problems my trip was cancelled so can you please cancel my flight ticket?

ASSISTANT: Ok, I will assist you with the concern you have provided.

USER: Thank you.

ASSISTANT: Please can I know your name?

USER: Sure, my name is Mark Jones.

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

USER: Oh! It's ok, no problem.

ASSISTANT: Thank you for choosing our agency.

USER: Thank you for your information.