You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I made a reservation earlier this week to give power point presentation. Unfortunately date got changed. So I want to change my existing reservation. Can you help me in this?

ASSISTANT: Ok, may I know your name, please?

USER: Sure, I am Gary Scott.

ASSISTANT: There is no reservation found on your name.

USER: OK, not a problem.

ASSISTANT: Thank you for availing with us.

USER: Thank you.

ASSISTANT: Have a nice day.