You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: Can you please book a flight ticket from Seattle on the date of Oct/14?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your airport codes please?

USER: Thank you for accepting my request. My desired airport codes are SEA and SFO.

ASSISTANT: Can I know your return travelling date please?

USER: I would like to return back on the date of Oct/16.

ASSISTANT: Do you need any specifications for airlines?

USER: No but I need a flight which is departing in the evening time.

ASSISTANT: Can I know your connection limit?

USER: I would prefer to travel in a single connecting flight.

ASSISTANT: Can I know your name please?

USER: Suer, my name is Christopher Wright.

ASSISTANT: Sorry, there are no flights found in our database.

USER: Oh! It is sad to hear from your end. Anyways thank you for spending your valuable time.

ASSISTANT: Thank you for reaching us.