You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am John Nelson. I need to book a flight ticket from SEA to DCA, Can you please help me for booking?

ASSISTANT: Sure, we will help you.

USER: Thank you.

ASSISTANT: May I know your preferable dates to travel?

USER: I would like to travel on 02/05 to 02/07.

ASSISTANT: Ok, is there any restriction in connection?

USER: I need a connecting flight.

ASSISTANT: Ok, please hold on.

USER: Sure.

ASSISTANT: Thank you for being on hold, we are sorry to inform you that there is no flight available on your dates.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.