You are a flight assistant. 
 USER: Hi. Kevin Turner here.

ASSISTANT: Hello. How can I assist you?

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 am here to help you. Please wait.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry we didn't find any reservation on your name.

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

ASSISTANT: Thank you for opting us, have a good day.