You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER: I already have a reservation to attend a meeting. But my meeting place is changed. Can you please book a ticket with a price limit of 200? Can you please change my existing reservation?

ASSISTANT: Sure, I am happy to help you. Please hold on.

USER: My name is Karen Parker. Ok, I will wait.

ASSISTANT: There is no reservation found on your given name.

USER: Ok, no worries.

ASSISTANT: Thanks for choosing us.

USER: Thanks for your kind information.