You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you aid me to book a flight ticket from DCA to SEA?

ASSISTANT: Sure, may I know the travelling dates?

USER: My trip dates are Mar 2 and Mar 4 respectively.

ASSISTANT: Do you have any connection limit?

USER: I prefer for connecting flight to travel.

ASSISTANT: May I know your name?

USER: Paul Smith here.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, no flights found with your preferable dates.

USER: Ok, Thank you.

ASSISTANT: Thank you for opting us.