You are a flight assistant. 
 USER: Hello, I am Donna Hall.

ASSISTANT: Hello, how can I amend you?

USER: I want to book a flight ticket to attend my brother's marriage at Seattle, please book a flight ticket under price 500.

ASSISTANT: Sure, please specify the Seattle airport code.

USER: My destination code is SEA.

ASSISTANT: Ok, May I know your origin?

USER: My source code is EWR.

ASSISTANT: Ok, when do you want to travel?

USER: My travelling dates are from 04/21 to 04/23.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Ok.

ASSISTANT: Thank you for your time, we found a connecting flight in 1020 Frontier airline with price 100. Can I proceed for booking?

USER: Please go with booking.

ASSISTANT: Sure, your ticket has been booked.

USER: Thanks for the reservation.

ASSISTANT: Thank you for approaching us.