You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am Richard Garcia. I want to book a flight ticket to attend my brother's engagement at Houston, please help me out.

ASSISTANT: Sure, Kindly mention your journey airport codes.

USER: I want to fly from BOS to IAH.

ASSISTANT: Ok, May I know your scheduled dates of your journey?

USER: My travelling dates are from 02/21 to 02/23.

ASSISTANT: Ok, how much do you want to spend on your ticket?

USER: I can spend up to 200.

ASSISTANT: Thank you for providing details, There were no flights found with your given requirements.

USER: No issues, thank you.

ASSISTANT: Thank you for reaching us.