You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you at this moment?

USER: I would like to book a ticket from IAH to HOU, can you please help me out?

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

USER: I am travelling on these dates July 7th and 9th.

ASSISTANT: Ok, please let me know your good name.

USER: Samuel King here.

ASSISTANT: Do you prefer any specific class to travel?

USER: I don't have any class preference.

ASSISTANT: Do you have any other specifications?

USER: I prefer departure in the evening.

ASSISTANT: Ok, please wait a moment.

USER: I need single connected flight.

ASSISTANT: Sorry Samuel King, no flight is available to you on your dates in evening time.

USER: Ok no problem, thank you for your services.

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