You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jacob White.

ASSISTANT: How can I assist you today?

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

ASSISTANT: Sure, i can help you with that. May I know your travel dates please?

USER: Sure, I have planned to travel on dates of Dec 24 and Dec 26.

ASSISTANT: May i know your class preference please?

USER: Actually I don't have any class preference so you can go with any one.

ASSISTANT: May I know your airline preference please?

USER: No, I am ok with any airlines.

ASSISTANT: Do you have specifications about your departure and arrival timings?

USER: I have planned to depart in evening time and returning in morning time because that times are very much comfortable to me.

ASSISTANT: May I know your connection limit please?

USER: As it is an emergency trip, I would prefer direct flight.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry, no flights available for you on those dates with your given details.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: Most welcome.