You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: My name is Deborah Carter.

ASSISTANT: Nice to meet you Carter.

USER: Suddenly my trip plan is changed.So I want to cancel my reservation.

ASSISTANT: Ok Carter, I will help you with that. Please wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting. Your reservation has found and I have cancelled successfully. Thank you for choosing us.

USER: Thank you for helping me.

ASSISTANT: Your welcome, have a good day.