You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Elizabeth Davis here. I have to do some modification in my previous flight ticket booking that there is a sudden event held at my home town, so I am unable to travel the trip. can you please help me out with changing of my reservation?

ASSISTANT: Sure, I will help you in change of flight ticket reservation.

USER: Ok.

ASSISTANT: Thanks for your time Elizabeth. But I am sorry to say that there is no flight reservation on your name to change it.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you.