You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Stephen Walker.

ASSISTANT: Is there any help that you need from our agency?

USER: For some issues I want to cancel my reservation, can you please help me with it?

ASSISTANT: Sure, I am happy to help in your ticket cancellation. Please give me some time to check your previous booking.

USER: Ok.

ASSISTANT: Base on your request, I am unable to find your previous reservation to cancel your ticket booking.

USER: It's ok. Thank you for the information.

ASSISTANT: Most welcome. Thank you for reaching us, have a great day.