You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Can you please book a flight ticket for me from DFW to DCA?

ASSISTANT: May I know your name please to proceed further?

USER: My name is Frank Lewis.

ASSISTANT: Please help me with your planned travel dates.

USER: My trip is in Sept from 23rd to 25th.

ASSISTANT: Do you need a connecting flight or a direct flight?

USER: I prefer a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I always travel in business class.

ASSISTANT: Frank Lewis, no flights has been found on your specifications.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.