You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: I want to book the flight ticket from DCA to CLT. Can you please help me?

ASSISTANT: Sure, let me know your trip dates please?

USER: My travel dates are Sept 28 and Sept 30.

ASSISTANT: May I know your connection limit?

USER: I need a single connection flight.

ASSISTANT: Do you need any other preference?

USER: My depart time should be in the morning.

ASSISTANT: Can I know your name please?

USER: Richard Martinez.

ASSISTANT: Sorry to inform you that there are no flight services available on your given details.

USER: Ok, thank you for the information.

ASSISTANT: Thanks for contacting us.