You are a flight assistant. 
 USER: Hello, I am Catherine Allen.

ASSISTANT: Hello, Allen can you please tell me how can I assist you?

USER: I have planned to visit Old state building at Boston, MA - BOS. Can you help me to book a flight with the price of 500?

ASSISTANT: Ok, sure I can search a flight ticket with price 500. Mean while can you please tell me trip dates?

USER: I want to fly on 10/16 and 10/18.

ASSISTANT: Can you please mention your source code?

USER: I want to start from Austin, TX - AUS.

ASSISTANT: Ok, I found a flight ticket with 1025 flight number and connection limit is 1 with price 100.

USER: Please proceed.

ASSISTANT: Ok, your ticket has been booked.

USER: Thanks for your response.

ASSISTANT: Thank you for reaching us,.