You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to book a ticket to attend a meeting at DCA. Can you please help me out from LAS?

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

USER: I would like to travel on July 17 and return back on July 19.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I am looking for a connecting flight.

ASSISTANT: May I know your good name please?

USER: My name is Samantha martin.

ASSISTANT: Do you have any class preference?

USER: I am ok with any class.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for reaching us.