You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am planning to visit Dallas, will you help me in booking the flight ticket from DCA to DFW?

ASSISTANT: Sure, may I know your trip dates?

USER: My preferable journey dates are Feb 25 and Feb 27.

ASSISTANT: Do you have any connection limit preference?

USER: I need a flight with single connection.

ASSISTANT: Could you help me with your name please?

USER: Myself Samantha Allen.

ASSISTANT: Sorry, there is no flight available for the mentioned dates.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.