You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I help you today?

USER: Please book a ticket from Philadelphia, PA-PHL to Houston, TX-HOU, for an Auto show.

ASSISTANT: Sure, can I have your name please?

USER: My name is Ronald Evans.

ASSISTANT: Ok, when are you planning to travel?

USER: My travelling dates are from 03/19 to 03/21.

ASSISTANT: Ok, any other requirements?

USER: Price limit is 1000. Connections limit is 1.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: thanks for waiting, no flights found with your requested details.

USER: Thanks for the help.

ASSISTANT: Thank you for choosing us.