You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you the best today?

USER: I want to book a flight on 4th June to met my parents. Can you book a flight for me?

ASSISTANT: Sure, to book a ticket can I know your source code and destination code?

USER: My source point is ORD and my destination is DTW.

ASSISTANT: Let me know your return date.

USER: I will return on June 06.

ASSISTANT: Do you have any other requirements?

USER: I prefer a connecting flight.

ASSISTANT: Unfortunately there is no flight found with your given requirements.

USER: Ok, thank you for the information.

ASSISTANT: May I know your name please?

USER: My name is Donald Davis.

ASSISTANT: Thank you.