You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I amend you today the best?

USER: I want to cancel my recent ticket booking due to office work that my manager did not approve my leaves, so can you please help me with cancellation?

ASSISTANT: Sorry for the inconvenience, We are euphoric to help you. Can you mention your name to check the reservation list?

USER: Sure, my name is Christopher Harris.

ASSISTANT: Ok, please be on hold.

USER: Ok.

ASSISTANT: We regret, There is no active reservation on your name to cancel it.

USER: Not a problem, thank you.

ASSISTANT: Thanks for reaching us, Have a great day!.