You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I'm Robert Roberts here. I would like to travel for a city roundup trip, can you please help me to book a ticket from NV-LAS to NV-LAS?

ASSISTANT: Sure, may I know your dates of journey?

USER: Sure, my dates are from 01/14 to 01/16. Please make sure that price is 200.

ASSISTANT: There is a flight with number 1023 in airline UA. Can I book it?

USER: Please confirm my ticket.

ASSISTANT: Your ticket is booked, have a safe journey.

USER: Thank you for your assistance.

ASSISTANT: Welcome.