You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I have to attend a Music Concert at San Francisco, could you please help me with booking a flight ticket from IAD to SFO?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: I would like to depart on Sept 21st and return on Sept 23rd.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight.

ASSISTANT: May I know your name?

USER: I am Kimberly Davis.

ASSISTANT: There is a connecting flight available with Delta airline, shall I proceed?

USER: Please confirm the booking.

ASSISTANT: Your booking is done with flight number 1008. Happy journey.

USER: I really appreciate your help, thank you for your service.

ASSISTANT: You are welcome, have a nice day.