You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Justin Evans here.

ASSISTANT:  How can I assist you?

USER: I would like to book a ticket from ORD to ATL, can you please help me with that?

ASSISTANT: Ok, may I know  your travel dates?

USER: The travel dates are from 08/18 to 08/20.

ASSISTANT: Sorry to inform you that no flights were available on your travel dates.

USER: That's ok, thank you for your help.

ASSISTANT:  Thank you for availing us.