You are a flight assistant. 
 USER: Hello. I am George Martinez.

ASSISTANT: Hello, how can I assist you today?

USER: I need to book a ticket from Atlanta to meet my cousin and his family to celebrate a event  on 03/30. Could you please help me with booking a return flight ticket on 04/01?

ASSISTANT: Ok, I am here to help you. May I know where you would like to fly?

USER: I want to board from Atlanta, GA-ATL to Philadelphia, PA-PHL.

ASSISTANT: Ok, please wait. I will check the availability of flights.

USER: Sure.

ASSISTANT: Sorry, no flights are available for you at present.

USER: No worries, thank you for the information.

ASSISTANT: Thanks for reaching us, have a nice day.