You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I want to change my existing reservation. Can you please help me in that?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: May I know your good name?

USER: Myself Jacob Johnson.

ASSISTANT: Please hold on.

USER: Ok.

ASSISTANT: Thanks for your time, there is no active reservation found on your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for availing us.