You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I want to book a ticket from DEN to PHL. Could you book a ticket?

ASSISTANT: Sure, I will help you. May I know your planned travel dates please?

USER: Departure is Feb, 27 and return date is Feb, 29.

ASSISTANT: Please help me with your name for booking purpose.

USER: My name is Jessica Green.

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

USER: I prefer connecting flight.

ASSISTANT: Do you have any other preferences?

USER: I would like to prefer business class.

ASSISTANT: Jessica Green, no flights has been found on your preferences.

USER: Thank you.

ASSISTANT: Thank you for choosing us.