You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

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

ASSISTANT: I am sorry to hear that. I will assist you. Please let me know with your name.

USER: Thank you for your response. Sure, my name is Debra Clark.

ASSISTANT: Please allow me a minute.

USER: Ok.

ASSISTANT: Debra Clark, I am really sorry to inform you that there is no booking done on your name to cancel.

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

ASSISTANT: Thank you for understanding.

USER: Thank you for your information.

ASSISTANT: Thank you for reaching us. Have a great time.