You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Sharon Martinez here.

ASSISTANT: Sharon Martinez, how may I assist you today?

USER:  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. Please allow me a minute.

USER: Ok.

ASSISTANT: Sharon Martinez, I am sorry to intimate you that there is no reservation booked on your name.

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