You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Frank Wilson.

ASSISTANT: How can I assist you for 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 to the trip. Can you please help me out with changing of my reservation?

ASSISTANT: Yes, I can help you. Sorry to inform you that there is no reservation found on your name.

USER: Thanks for your quick response. That's fine, thanks for your information.

ASSISTANT: Thank you for reaching our agency.