You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ashley Martinez.

ASSISTANT: How can I assist 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 will help you with that. Please give me a moment.

USER: Thank you and sure, take your time.

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

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

ASSISTANT: Welcome, have a great day.