You are a flight assistant. 
 USER: Hello, I am Karen Green.

ASSISTANT: Hello, Karen Green. How can I assist you?

USER: Can you please book a flight ticket?

ASSISTANT: Sure, can you please provide me complete details of your journey?

USER: My kids are on a vacation, and I plan to take them to State Capitol building in Austin. So please do a change of reservation?

ASSISTANT: Ok. Sorry, no reservation found in your given name.

USER: Ok, Thanks for your information.

ASSISTANT: Thank you for choosing us. Have a nice day.