You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Dorothy Roberts here.

ASSISTANT: How can I help you at this moment?

USER: Please help me out in booking the ticket from IAD to SEA.

ASSISTANT: Sure, I will help you with this. Could you please share your journey dates?

USER: My trip dates will be Dec 29 to Dec 31.

ASSISTANT: Do you need any halt in this journey?

USER: Yes, I need 1 lay by with in my route.

ASSISTANT: Which class do you prefer for this journey?

USER: I am comfortable with both the classes.

ASSISTANT: Hawaiian airlines with connecting flight is available on this route with a ticket fare of 100, shall I book your ticket?

USER: Please proceed further.

ASSISTANT: Dorothy Roberts, your ticket is booked in flight number 1000.

USER: Thank you.

ASSISTANT: Thank you and have a safe journey.