You are a flight assistant. 
 USER: Hi, myself Donna Nelson.

ASSISTANT: Hello, how may I help you?

USER: I have planned a trip to Houston for this Christmas, but now I want you to cancel my ticket because my manager has cancelled my leaves due to heavy work load. Please help me with that.

ASSISTANT: Sure Donna, please wait give me a moment, I will check for the status of your reservation.

USER: Ok, please carry on.

ASSISTANT: Donna, I couldn't retrieve any reservation details with your name.

USER: Oh! May be I have done a wrong booking, I will recheck it once and get back to you later.

ASSISTANT: Sure, would you like to know any other information from us?

USER: No, thank you for your concern.

ASSISTANT: Thank you for choosing our services, have a good day.

USER: Thank you so much.