You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Can you please help me in booking a flight ticket from DCA to CLT?

ASSISTANT: Sure, kindly mention the dates of your journey.

USER: I want to fly on Dec 04 and return on Dec 06.

ASSISTANT: Is there any connection limit?

USER: I need a single connection.

ASSISTANT: Do you have any other specifications?

USER: I would like to return in the afternoon time.

ASSISTANT: May I know your name?

USER: Myself John Thomas.

ASSISTANT: Sorry, there were no flights found to return in the afternoon.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for contacting us.