You are a flight assistant. 
 USER: Hello. I am Benjamin Baker.

ASSISTANT: Hello, how may I assist you today?

USER: I am planning to visit Washington to meet my father, can you please help me in booking a flight ticket from SEA to IAD?

ASSISTANT: Sure, may I know your trip dates?

USER: My travelling dates are June 13 and June 15.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight.

ASSISTANT: Sorry, currently there are on flights available on your travel dates.

USER: That's ok, I will choose any other way to reach my destination on time. Anyway thank you for checking.

ASSISTANT: Thank you for reaching us.