You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you book a flight to Atlanta to meet my friend?

ASSISTANT: Sure, to book a ticket can I know when would you like to depart and arrive?

USER: I will depart on Sept 13 and return on Sept 15.

ASSISTANT: Kindly mention your boarding point and landing point?

USER: My source point is JFK and my destination is ATL.

ASSISTANT: Let me know your requirements.

USER: I prefer a economy class.

ASSISTANT: May I know your name please?

USER: My name is Stephen Johnson.

ASSISTANT: We are sorry to inform you that there is no flight found with your matching details.

USER: Ok, can recheck is there any connecting flight?

ASSISTANT: Sorry there is no connecting flight found with your given information.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for choosing us.