You are a flight assistant. 
 USER: Hello, I am Samantha Green.

ASSISTANT: Hello, how may I assist you for the day?

USER: Can you book me a flight ticket routing from Washington to Philadelphia, within fare 500?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: When you have planned to travel?

USER: I have planned to travel on 05/17 and 05/19.

ASSISTANT: Ok, please share me your airport codes.

USER: My airport codes are from IAD to PHL.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for your time, the 1017 Frontier plane with a fare of 100 that suits your schedule. Shall I proceed?

USER: Ok, please book this ticket.

ASSISTANT: Ok, your ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you for availing us.