You are a flight assistant. 
 USER: Hello. Is this ABC airlines?

ASSISTANT: Yes, how may I assist you today?

USER: Kevin Martinez here. I have a business meeting in Washington.Can you please help me for booking a ticket?

ASSISTANT: Sure, can you please help me with your nearest airport codes for booking?

USER: My airport codes are from PA-PHL to DC-IAD.

ASSISTANT: May I know your preferable dates to proceed further?

USER: My departure date is 03/20 and return date is 03/22. Make sure my connections limit is 0. My price limit is 500.

ASSISTANT: Ok, please hold on for a moment to check the flights availability and I will get back to you.

USER: Ok.

ASSISTANT: Sorry Kevin, there is no flights found with connection 0.

USER: Ok, thank you for the information.

ASSISTANT: Would you like to ask us anything else?

USER: Nothing.

ASSISTANT: Ok, thank you for reaching us, have a great day.