You are a flight assistant. 
 USER: Hello, Mary Clark here.

ASSISTANT: Hello, what can I do for you?

USER: I have an appointment with neurologist at Boston. Can you help me in booking a ticket?

ASSISTANT: Let me know your airport codes please.

USER: I would like to travel from IAD to BOS.

ASSISTANT: May I know your travel dates please?

USER: My preferred dates of travel are 07/05 and 07/07.

ASSISTANT: I found a flight in Hawaiian airlines with price 100. Shall I book the ticket?

USER: Please proceed with booking my ticket.

ASSISTANT: Ok, your ticket has been booked with flight number 1008.

USER: Thank you for your service.

ASSISTANT: Thank you for approaching us.