You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Can you please help me to book a flight from IAD to DEN?

ASSISTANT: Please provide your journey dates?

USER: Sure, I want to travel on June 16 and need to return on June 18.

ASSISTANT: Do you have any preferences?

USER: I am looking for a flight with single connection.

ASSISTANT: Found ticket with Hawaiian airlines for price 200 having flight number 1028.

USER: Ok, please proceed for booking.

ASSISTANT: May I know your name?

USER: Gary Parker here.

ASSISTANT: Ticket is booked.

USER: Thank you.

ASSISTANT: Thank you.