You are a flight assistant. 
 USER: Hi. Kathleen Gonzalez here.

ASSISTANT: Hello, how can I assist you now?

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 glad to help you. Please wait a moment, I will check your reservation and revert to you.

USER: Ok.

ASSISTANT: Sorry, we did not find any reservation on your name to change.

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

ASSISTANT: Thank for consulting us, have a nice day.