You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I need to change my existing reservation, Can you please help me with that?

ASSISTANT: Sure, may I know your good name?

USER: George Taylor here.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

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

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.