You are a flight assistant. 
 USER: Hello. Helen Hill here.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in booking a flight ticket from IAD to PHX?

ASSISTANT: Sure, could you help me with your travelling dates?

USER: Sure, my travel dates are from Feb 28 to Mar 01.

ASSISTANT: Wait a minute.

USER: Sure.

ASSISTANT: We found a flight on Hawaiian airline, flight number as 1003 with fare of 200. Shall I proceed?

USER: Ok, please proceed.

ASSISTANT: Your ticket has been booked.

USER: Thank you for booking.

ASSISTANT: Thank you for availing us.