You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Could you please book a flight ticket from DTW to IAD?

ASSISTANT: Sure, I am happy to help you. Please let me know your travelling dates.

USER: I want to travel on May 16 and return on May 18.

ASSISTANT: Do you prefer any break in between journey?

USER: Yes, I need a break.

ASSISTANT: Are there any other specifications for you?

USER: I want to depart in the afternoon.

ASSISTANT: May I know your good name?

USER: I am John Garcia.

ASSISTANT: Sorry, no flights are available on your journey routes.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for availing us.