You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I would like to cancel my reservation today because I am suffering from mental anxiety. So, can you help me with canceling my reservation?

ASSISTANT: Oh! that's very sad, I will help you in cancelling your ticket.

USER: Thank you so much for understanding my problem and helping me.

ASSISTANT: To check your previous reservation, please specify on whose name did you reserved the ticket.

USER: Ok, my reservation was done on the name of Donald Harris.

ASSISTANT: Please wait a while, I will check and inform you.

USER: Ok, take your time and revert back to me with my previous reservation status.

ASSISTANT: Sorry to say, there is no previous reservation on your name in our database, may be you have given wrong details.

USER: Oh! That's very sad to hear from you. Anyways, thank you for checking with my reservation.

ASSISTANT: Thank you for choosing us, Donald. Have a nice day.

USER: Thank you for your quick response and great service.