You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help 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 am mirthful to help you with that.

USER: Ok.

ASSISTANT: Can you please share me your name?

USER: Betty Lopez here.

ASSISTANT: Sorry, no reservation found on your name in our database.

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

ASSISTANT: Thank you for choosing us, have a nice day.