You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Please cancel my recent reservation, because I postponed my trip.

ASSISTANT: Sure, we are here to assist you. May I know your name?

USER: Thank you. I am Helen King.

ASSISTANT: Ok, please give me a minute.

USER: Sure.

ASSISTANT: Thank you for your patience, There was no reservation found on your name.

USER: Ok, thanks for the response.

ASSISTANT: Thank you for choosing our agency.