You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How may I assist you?

USER: I am Elizabeth Martin. Please book a round trip ticket with San Francisco, CA-SFO.

ASSISTANT: Please provide your trip dates to get a flight for you.

USER: Travelling dates are from 12/31 to 01/02. Connections limit is 1. Ticket price limit is 500.

ASSISTANT: Thanks for your details, there is a flight-1019 with connection 1 and price 100, can I proceed with UA airline?

USER: Please book a ticket.

ASSISTANT: Ok, your ticket has been done.

USER: Thanks.