You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Rebecca Parker here.

ASSISTANT: How may I aid you today?

USER: I would like to visit Phoenix for a business trip, can you please help me out with booking of a flight ticket from DCA to PHX?

ASSISTANT: Sure, please mention your travelling dates.

USER: Ok, I am planning to leave my location on 08/01 and please book my return ticket also on 08/03.

ASSISTANT: Please take your time.

USER: Ok, take your time.

ASSISTANT: There is a direct flight with the price 100 in Hawaiian airlines, can I proceed with the booking?

USER: That's fine for me to travel, you can proceed with booking.

ASSISTANT: Your ticket has been reserved with the flight number 1000. Thank you for booking flight ticket with us.