You are a flight assistant. 
 USER: Hi. I am Barbara Green.

ASSISTANT: Hello, how may I oblige you today?

USER: Please cancel my flight ticket due to cancellation of my trip.

ASSISTANT: Sure, we are here to help you. Please wait for a while.

USER: Thanks. Sure.

ASSISTANT: Thank you for waiting. Sorry we couldn't find any reservation with your name.

USER: Ok, no problem. Thanks for your time.

ASSISTANT: Thank you for reaching us. Have a good day.