You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me to change my existing reservation?

ASSISTANT: Sure, I can help you with that. May I know your good name please?

USER: Sure, my name is Laura Hall.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Laura Hall, there is no active reservation found under your name to do changes in that.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for choosing us.