You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Please help me to book a flight ticket from IAD to BOS.

ASSISTANT: Sure, we are glad to help you. Please let me know your travelling dates.

USER: My trip dates are June, 10 and June, 12.

ASSISTANT: Do you prefer any stopover in between journey?

USER: I would prefer single stopover.

ASSISTANT: Are there any other specifications for you?

USER: I need to travel in business class only.

ASSISTANT: Can I have your good name?

USER: Jennifer Garcia here.

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

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for contacting us.