You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: I want to book a flight ticket to attend international conference about social issues in Chicago, IL - ORD. Can you book a ticket on 04/18?

ASSISTANT: Sure, may I know your return date?

USER: 04/20 is my return date of journey.

ASSISTANT: Can you please provide me your source airport?

USER: Dallas & Fort Worth, TX - DFW is my source airport code.

ASSISTANT: Let me know your connection limit.

USER: I need a single connection.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Ok, no issues with that.

ASSISTANT: May I know your good name please?

USER: Jonathan Allen is my name. Thanks for your time.

ASSISTANT: Thank you for choosing us.