You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Sure, will you mention your name for checking the reservation status?

USER: Thank you for your response, my name is Dennis Walker.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: There is no reservation found under your name.

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

ASSISTANT: Welcome, have a great day.