You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: My name is Steven Campbell. I would like to book a flight ticket to meet my friend in Houston. Can you help me for booking a flight ticket from PHL to IAH?

ASSISTANT: Sure, I am here to help you. Could you please share your journey dates?

USER: My travelling dates are Nov 12 and Nov 14.

ASSISTANT: Do you have any connection limit for this trip?

USER: I need a direct flight in my journey.

ASSISTANT: May I know your specific depart and arrival timings for this trip?

USER: My return time is afternoon.

ASSISTANT: Do you have any other specifications for this trip?

USER: No.

ASSISTANT: Steven Campbell, there are no flight services are available on this route on your provided dates.

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

ASSISTANT: Thank you for contacting us.

USER: Welcome.