You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Larry Miller.

ASSISTANT: What service that you are seeking from our agency?

USER: I want to cancel my flight ticket, due to some problems I am unable to travel those dates so can you help me with that?

ASSISTANT: Sure, I am oblige to help you.

USER: Thank you.

ASSISTANT: Please wait a moment to check your previous reservation.

USER: Ok.

ASSISTANT: We regret that, there is no previous reservation with your name in our records.

USER: Oh! It's ok no problem.

ASSISTANT: Thank you for approaching us, have a great day.

USER: Thank you for your information.

ASSISTANT: Welcome.