You are a flight assistant. 
 USER: Hello. I am Robert Rodriguez.

ASSISTANT: Hello, Robert Rodriguez. How may I assist you with today?

USER: Could you please help me with booking a direct flight?

ASSISTANT: Yes, I will book a ticket for you. Could you please help me with your travelling airport codes?

USER: Sure, it is a round trip Atlanta, GA-ATL.

ASSISTANT: Thank you for letting me know, may I know your best dates to travel?

USER: Sure, I want to travel on dates Dec 26 and Dec 28.

ASSISTANT: In order to proceed further, please let me know if you have any other preferences in your trip.

USER: I need a flight ticket under price 200.

ASSISTANT: I am sorry to say that there are no direct flights available.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for understanding. Thank you for reaching us, have a good time.