You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Jonathan Thomas from Washington.

ASSISTANT: How can I assist you?

USER: I am looking to plan a round trip from and to IAD. Can you help me in booking a ticket?

ASSISTANT: Sure, may I know your journey dates please?

USER: My planned journey dates are 05/20 and 05/22.

ASSISTANT: Spirit airlines is having a flight with travel charge of 400, shall I proceed for booking?

USER: Please book the ticket.

ASSISTANT: Your ticket has been booked with flight-1016, have a safe journey.

USER: Thank you for your assistance.

ASSISTANT: Thank you for choosing us.