You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Myself Steven Jackson. I need to change my existing reservation, can you please help me out?

ASSISTANT: Sure, I will help you.

USER: Thank you for your kind reply.

ASSISTANT: Please wait a moment I will check the reservation list.

USER: Sure, I will be waiting.

ASSISTANT: Sorry Steven Jackson, there is no active reservation on your name.

USER: That's ok, thank you for searching details.

ASSISTANT: Thank you so much for choosing us.

USER: You are welcome.