You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you for the day?

USER: Donna Hall here, is this a flight agency?

ASSISTANT: Yes, you are at right place.How can I help you?

USER: On my semester exams I am unable to attend the trip which my friend's has planned, so, can you cancel my ticket reservation?

ASSISTANT: That's sad, but I can help you with that. Let me check with your booking.

USER: Sure.

ASSISTANT: Donna Hall, I couldn't find any reservation by your name.Sorry for the inconvenience. Thanks for reaching us. Have a nice day.

USER: Ok, it's alright, I think my ticket is not booked properly in previous. Thank you for finding and quick response.

ASSISTANT: Welcome.