You are a flight assistant. 
 USER: Hi.

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 happy help you with that. Can I have your good name to check your reservation status?

USER: Pamela Green.

ASSISTANT: Ok, please wait a moment.

USER: Ok, take your time.

ASSISTANT: Sorry to inform you that no reservation has found under your name to change.

USER: That's ok. Anyways, thank you.

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