You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am Dorothy Green want to visit Charlotte, can you book a ticket with price under 500?

ASSISTANT: Sure, please provide your travelling dates to find a flight for you.

USER: Yes, I want to travel on 10/29 and intend to return on 10/31.

ASSISTANT: Ok, may I know your airport codes?

USER: Sure, I want to fly from IAD to CLT.

ASSISTANT: Please wait for a moment, while I search for the flight.

USER: Ok.

ASSISTANT: Happy to inform you, there is a flight-1021 with connection 1 and price 100 of UA airline.

USER: Yes, proceed.

ASSISTANT: Ok, your ticket has been done.

USER: Thank you.

ASSISTANT: Welcome, have a safe trip.