You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. What help that I can do for you?

USER: Myself Anna Martinez, I have placed a flight ticket booking form my side to DEN but it was actually done my father accidentally. Can you please help me in cancellation of my reservation?

ASSISTANT: Sure, I am glad to help and give me some time to check your reservation status in my previous ticket booking list.

USER: Thank you for providing me the positive response. Sure, take your time and go for the checking.

ASSISTANT: Thank you for your patience, I am unable find your ticket in our previous ticket booking list to help you out in flight ticket cancellation.

USER: It's ok, he might be placed the booking with the another agency. Anyways thank you for the information and spending your valuable time in checking my reservation.

ASSISTANT: Ok, thank you for reaching us. Have a nice day.