You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I want to cancel my reservation due to sudden prepone of interview at New York, can you please help me?

ASSISTANT: Ok, please can I know your name to check?

USER: My name is John Miller.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Ok, thank you for waiting. Sorry as per the reservation records there is no reservation been found to cancel.

USER: Ok, not a problem.

ASSISTANT: Thank you for choosing our agency, have a safe journey.

USER: Thank you.