You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

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 in changing my reservation?

ASSISTANT: Sure, I am here to help you out.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Myself Kathleen Lopez.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Kathleen Lopez, we haven't found any reservation under your name in our database.

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

ASSISTANT: Thank you for choosing us.