You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I aid you today?

USER: Please book a ticket from Philadelphia, PA-PHL to Houston, TX-IAH, for arts and crafts festival. I'm Eric Parker.

ASSISTANT: Sure, please share your travelling dates?

USER: Travelling dates are from 04/14 to 04/16.

ASSISTANT: Do you have any other specifications?

USER: Price limit is 1000. I need a direct flight.

ASSISTANT: Thanks for providing your details, no direct flights are available with your request.

USER: Thanks.

ASSISTANT: Thanks for approaching us.