You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Rebecca Lewis.

ASSISTANT: How can I assist you?

USER: I am planning for a round trip, could you please help me with booking a flight ticket from IAD?

ASSISTANT: Sure, can I know the travel dates please?

USER: I would like to depart on Mar 7th and return on Mar 9th.

ASSISTANT: Ok, wait a moment please.

USER: Make sure that my depart time is afternoon.

ASSISTANT: There is a connecting flight in Delta airline with price 100, can I book it?

USER: Yes, please confirm the booking.

ASSISTANT: Your ticket has been booked with flight number 1014.

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

ASSISTANT: Thank you for approaching us.