You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Betty Lopez here. Could you book my ticket from DCA to SEA?

ASSISTANT: Sure, on what dates are you planning to make your trip?

USER: My trip dates are July 19 and July 21.

ASSISTANT: How many connections do you need?

USER: I need a connecting flight.

ASSISTANT: At what time do you want to depart and return?

USER: I want to return in the afternoon.

ASSISTANT: Ok, please allow me a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket.

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us.