You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: My name Michelle Turner, I want to book a direct flight to meet my grand father at Houston. Can you book a flight with in fare of 1000?

ASSISTANT: Sure, May I know the journey codes?

USER: I will fly from airport DC-DCA to airport TX-IAH.

ASSISTANT: Please help me with your travel dates.

USER: I will travel on 02/26 and return on 02/28.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Ok, thank you for the details.

ASSISTANT: Thank you for availing us.