You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Melissa King.

ASSISTANT: How may I guide you?

USER: I think I am at right place, I have already booked my ticket with JetBlue airlines in the month of August, but now I am unable to travel on that month.

ASSISTANT: So would you like to cancel the existing reservation?

USER: Yes, I want you to cancel my reservation.

ASSISTANT: I am sorry to inform you that there are no reservations on your name.

USER: That's fine as I already wanted to cancel my existing reservation.

ASSISTANT: Thank you, have a good day.

USER: Thank you for your time.