You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be at your service today?

USER: I would like to book a flight ticket to Houston, IAH to overview the city. Can you help me to book a ticket from Philadelphia, PHL?

ASSISTANT: Sure, When do you planned to visit there?

USER: Dates are 08/16 and 08/18.

ASSISTANT: Ok, do you have any other specifications?

USER: I need break in my journey. Price should not cross 200.

ASSISTANT: Can I have your name please?

USER: I am Katherine Scott.

ASSISTANT: Katherine, sorry to say you that there is no flight available on your route.

USER: No problem, I will check with another airline.

ASSISTANT: Ok. Thank you for choosing us.

USER: Thank you.