You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER:  As I am a scientist, I want to attend science festival with my students at Atlanta. Can you help me to book a ticket from ORD to ATL?

ASSISTANT: Sure, let me know your journey dates?

USER: My trip dates are 12/09 and 12/11.

ASSISTANT: Do you need any specifications?

USER: Price should not cross 5000. I need only direct flight.

ASSISTANT: Please hold on a minute.

USER: Sure.

ASSISTANT: May I know your good name please?

USER: Helen Hernandez here.

ASSISTANT: Sorry to inform that, there are no direct flight found on your given dates.

USER: No problem, Thanks for the information.

ASSISTANT: Thanks for reaching us.