You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, let me know what help are you expecting from our service?

USER: I would cancel my reservation because suddenly my daughter project presented is cancelled, and not rescheduled for any other days.

ASSISTANT: That's sad to hear.

USER: Please, check the reservation details on Mark Clark.

ASSISTANT: May I know on which name the ticket is booked with? Sure, wait a minute.

USER: Ok, I mentioned it above.

ASSISTANT: Sorry, there is no reservation found on the name you provided. So, I can't cancel it.

USER: That's ok, no issue.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your information.