You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

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

ASSISTANT: Sure, I will help you. Please wait for a moment.

USER: Ok, thank you for your response.

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

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: You are welcome, have a nice day.