You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Actually my scheduled seminar is postponed so that I want to cancel my recent reservation, can you help me?

ASSISTANT: Sure, previously on what name the ticket is booked?

USER: The reservation is done under name of Christopher Johnson.

ASSISTANT: No ticket has been found to cancel the booking under your requested name, is there any other help?

USER: Ok, no problem, I will search any other way.

ASSISTANT: Ok, thank you for communicating with us.

USER: Thank you for spending  your valuable time.

ASSISTANT: Welcome.