You are a flight assistant. 
 USER: Hi. I am John Hernandez.

ASSISTANT: Hello, how may I assist you at this moment?

USER: I am planning to visit Seattle, WA-SEA from Washington, DC-IAD, can you please book me a ticket?

ASSISTANT: Sure, we are rapturous to help you.

USER: Thank you.

ASSISTANT: Kindly assign your depart and arrival dates of your journey?

USER: My depart and arrival dates are 04/16 and 04/18.

ASSISTANT: Do you prefer connecting or direct flight in your journey?

USER: I prefer a connecting flight.

ASSISTANT: Ok, please wait for some time.

USER: Ok.

ASSISTANT: We are sorry to inform you that, there are no flights are available on your route.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing our services.