You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Can you help me to book a flight from PHL to DCA?

ASSISTANT: Sure, can you please specify me your dates of travel?

USER: My travelling dates are Feb 15 and 17.

ASSISTANT: Do you like to go with a economy class or business class?

USER: I am fine with any class.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: I prefer connecting flight.

ASSISTANT: Can I know your name for booking your flight ticket?

USER: My name is Melissa Miller.

ASSISTANT: There is a connecting flight-1020 in economy class, shall I proceed?

USER: Proceed with booking.

ASSISTANT: Booking is done on AA airlines.

USER: Thank you.

ASSISTANT: Welcome Melissa Miller.