You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I need to meet my old friend, can you please book the ticket from SEA to DCA?

ASSISTANT: Sure, let me know your travelling dates.

USER: Sure, I would like to depart from my source location on 18th June and I want to return back by 20th June.

ASSISTANT: May I know your connection limit?

USER: I prefer single connected flight.

ASSISTANT: Do you have any other requirements?

USER: I prefer business class to travel.

ASSISTANT: May I know your name please?

USER: My name is Pamela Williams.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Oh! That's ok, thank you for giving the information anyways.

ASSISTANT: Thank you for opting us.