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 SEA to DEN, 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 Sept 16th and 18th.

ASSISTANT: Do you have any specifications?

USER: I prefer departure time in the afternoon.

ASSISTANT: Can I have your good name please?

USER: Samantha Smith here.

ASSISTANT: Are  you looking for any connecting flight?

USER: I prefer direct flight.

ASSISTANT: Sorry to inform you that no direct flight is available to you on your dates.

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

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