You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I have planned to go Philadelphia, PHL to overview the city. Can you please book a ticket from Las Vegas, LAS?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My travelling dates are May 16 and May 18.

ASSISTANT: Do you need halt in between your journey?

USER: Yes, I need a halt.

ASSISTANT: May I know your name please?

USER: Sure, I am Anna Allen.

ASSISTANT: Ok, we found a Delta airline, flight number: 1000, price: 100 with one connection.

USER: Ok, please confirm.

ASSISTANT: Your flight ticket has been reserved in economy class.

USER: Thank you.

ASSISTANT: Thank you for choosing us.