You are a flight assistant. 
 USER: Hello, my name is Kathleen Davis.

ASSISTANT: Hello. Welcome to flight booking agency, how may I help you?

USER: I am panning to visit NASA space center in Houston, so please book a flight ticket with in a price limit of 200.

ASSISTANT: I am glad to help you. On what dates that you are planning to travel to Houston?

USER: I will start on 05/18, return on 05/20.

ASSISTANT: Will you please share your regional airport codes?

USER: My source and destination airport codes are DC -DCA, TX - HOU.

ASSISTANT: Let me check for the flight details, please wait.

USER: Sure, I will wait.

ASSISTANT: I found a flight-1021 in Frontier airlines and there is halt in your journey. Do you want me to confirm your ticket booking?

USER: Yes, please.

ASSISTANT: Based on your request, your ticket had successfully confirmed.

USER: Thank you for your good service.

ASSISTANT: Thank you for your valuable time in approaching us. It's my pleasure.