You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: May I know your trip dates?

USER: Thank you. I have planned my travel dates as Sept 24 and Sept 26.

ASSISTANT: Do you have any connecting flight preferences?

USER: I am looking for single connecting flight.

ASSISTANT: Is there any other concern?

USER: I do not have any more specifications.

ASSISTANT: May I know your name please?

USER: Sure, myself David Miller.

ASSISTANT: No flights found as per your preferences in our database.

USER: That is ok, no problem. Anyway, thank you for your time.

ASSISTANT: Thank you for choosing us.

USER: Most welcome.