You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please assist me for booking a flight ticket from DEN to DCA to attend for a Beer festival?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My planned dates are on Nov 13 and 15.

ASSISTANT: Is there any class preference for you?

USER: I am fine with any class.

ASSISTANT: Do you have any other specifications?

USER: I need a connected flight.

ASSISTANT: May I know your good name?

USER: My name is Michael Smith.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Ok, thanks for your assistance.

ASSISTANT: Thank you for reaching us.