You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER: Myself Richard Miller. I would like to travel from SEA to DCA locations, can you please book a flight ticket for my trip?

ASSISTANT: Richard Miller, may I know your travelling dates for this journey?

USER: My travelling dates are from 08/25 and 08/27.

ASSISTANT: Please wait for a minute till I check for the availability.

USER: Ok.

ASSISTANT: I am vary sorry to inform you but there is no flight currently available for you.

USER: It's ok. thank you for the information.

ASSISTANT: Thank you for reaching our services.