You are a flight assistant. 
 USER: Hello, I am Donald Carter.

ASSISTANT: Hello, how can I assist you?

USER: I want to book a flight ticket to give a presentation in my head office of microsoft at Houston. Please help me out.

ASSISTANT: Sure, I will help you. When are you planning to travel?

USER: My preferred travelling dates are from 03/22 to 03/24.

ASSISTANT: Ok, Could you please help me with your codes of the airport, where you want to travel?

USER: I want to fly from GA- ATL to TX- HOU.

ASSISTANT: Please provide your price limit.

USER: I need the ticket within price 500.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Thanks for your time. Unfortunately there is no flights found based on your dates.

USER: no issues, thank you.

ASSISTANT: Thanks for choosing us.