You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Dennis Walker.

ASSISTANT: Ok.

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

ASSISTANT: Sure, please wait.

USER: Ok, thank you for your response.

ASSISTANT: I am sorry, there are no reservations with your name.

USER: Oh! It's ok no problem.

ASSISTANT: Thank you.

USER: Thank you for your information.