You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you now?

USER: Can you book a flight ticket from IAH to PHL?

ASSISTANT: Sure, I am happy to help you with that. Can  I have your travel dates please?

USER: My trip dates are 08/21 and 08/23.

ASSISTANT: Ok, please let me know your class preferences.

USER: I prefer business class.

ASSISTANT: Do you have any other specifications?

USER: I want a connecting flight.

ASSISTANT: Can I have your good name please?

USER: Jack Lewis here.

ASSISTANT: Sorry Jack Lewis, no flight is available to you on your dates.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us, have a good day.