You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Katherine Clark here.

ASSISTANT: Welcome to flight booking agency Katherine Clark.

USER: I need a direct flight from IAD to HOU, can you help me?

ASSISTANT: Sure, I can help you before that may I have your trip dates?

USER: Sure, my preferable dates of journey are from 03/17 to 03/19.

ASSISTANT: There is a flight-1011 with price 800, shall I proceed with booking?

USER: Please book my ticket.

ASSISTANT: Ok, your ticket has been done with Spirit airline.

USER: Thank you for your response.

ASSISTANT: Welcome, have a safe trip.