You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: Due to some reasons I want to cancel my flight ticket which I have booked in past week, can you help in cancelling my flight ticket?

ASSISTANT: May I know your name?

USER: Sure, I am Sarah Hill.

ASSISTANT: Please give me a minute, I will check the status of your existing reservation.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: Ok, no problem with that one, thank you for your response.

ASSISTANT: Thank you for contacting us, have a nice day.

USER: Welcome.