You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I would like to change my reservation as I am leaving for delegates meet, can you please help me out?

ASSISTANT: Sure, I am gleeful to help you with that. May I know your name please?

USER: Paul Clark here.

ASSISTANT: Please wait for a while, let me check your previous reservation status.

USER: Sure.

ASSISTANT: Thank you for waiting. There is no reservation found on your name in our database to change it.

USER: Ok no problem, thank you for your services.

ASSISTANT: Most welcome, thank you for reaching us. Have a great day.