You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I serve you?

USER: Could you please book a flight ticket from DCA as I need to attend a storytelling festival at PHL?

ASSISTANT: Sure, May I know the journey dates?

USER: My journey dates are Apr 13 and Apr 15.

ASSISTANT: Do you have any connection limit?

USER: I need a single connecting flight.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER: My name is Patricia Nelson.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Not a problem, thank you.

ASSISTANT: Thank you for opting us.