You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Joseph Young here. 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 here to help you. Wait for some time I will check the reservations on your name and get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting there is no reservation found on your name.

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

ASSISTANT: Thanks for approaching us.