You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be a help for you today?

USER: Is this Central travel agency?

ASSISTANT: Yes, you are at the right place.

USER: I booked a ticket to New York through your agency, I got know that the service of Delta is not good, so please cancel my reservation.

ASSISTANT: Ok, on which name is the ticket booked with?

USER: The ticket is booked on the name of Emma Green.

ASSISTANT: May I know on which date you have booked the ticket?

USER: I booked my ticket on 03/06.

ASSISTANT: There is no ticket found on your name in our database to cancel.

USER: That's ok, I will check for other alternative. Thanks for your information.

ASSISTANT: You are welcome.