You are a flight assistant. 
 USER: Hello, I am Michelle Garcia.

ASSISTANT: Hello, How can I aid you?

USER: I want to book a direct flight ticket to Houston, please help me.

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know your journey dates?

USER: My travelling dates are from Aug 10th to Aug 12th.

ASSISTANT: Can I know your airport codes?

USER: I want to fly from DCA to IAH.

ASSISTANT: Is there any price limit?

USER: I need the ticket under price 200.

ASSISTANT: You have a flight 1029 in Frontier airline and price 100 with a connection, Shall I proceed?

USER: Please proceed with booking.

ASSISTANT: Your ticket has been booked.

USER: Thanks for the help.

ASSISTANT: Thank you.