You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: My name is Paul Perez. I want to visit NASA space station with my kids, can you help me in booking the ticket.

ASSISTANT: Yes, please provide the airport codes along with travelling dates?

USER: It's from PHL to HOU. The dates of travel are from 08/17 to 08/19.

ASSISTANT: Ok, please hold on for a moment.

USER: Please make sure the connection is 0.

ASSISTANT: Sorry, there are no flights available which matches with your requirements.

USER: That's ok. Thank you for checking.

ASSISTANT: Thank you, have a good day.