You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I'm Justin Lee, can you please book a flight ticket from 10/16 and 10/18 dates?

ASSISTANT: Sure, I will help you with that. May I know the airport codes?

USER: My travelling airport codes are from EWR to IAD.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, there is a flight 1000 in Frontier airline has the price 100.Can I proceed?

USER: Sure, please proceed it.

ASSISTANT: Justin, your ticket has been booked.

USER: Thank you so much.

ASSISTANT: Thank you for contacting us, have a safe journey.