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 DFW to LAX, 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 Dec 23rd and 25th.

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

USER: Gregory Allen here.

ASSISTANT: Do you have any specifications to get best flight for you?

USER: I need direct flight.

ASSISTANT: Sorry Gregory Allen, no  direct flight is available to you on your dates.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

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