You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: Elizabeth Davis 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 to the trip. Can you please help me out with changing of my reservation?

ASSISTANT: Sure, I will help you with that.

USER: Thank you for your quick response.

ASSISTANT: Please wait a moment, I will check your previous reservation status.

USER: Sure.

ASSISTANT: There is no previous reservation found under your name.

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

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