You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid 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, we are glad to assist you in that.

USER: Ok.

ASSISTANT: May I know your name for further proceeding?

USER: Jason Allen here.

ASSISTANT: I am very sorry to inform you that there is no reservation found under your name in our database.

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

ASSISTANT: Thanks for reaching us.