You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I need to book a ticket from IAD to EWR. Could you book a ticket?

ASSISTANT: Please provide your journey dates.

USER: Departure is by July, 8 and return date is July, 10.

ASSISTANT: Do you need any connection limit?

USER: I would be comfortable with single stop over.

ASSISTANT: Do you have any other specifications?

USER: I prefer business class.

ASSISTANT: May I know your name?

USER: My name is Raymond Nelson.

ASSISTANT: There are no flights available on your routes.

USER: Thank you.

ASSISTANT: Thank you for opting us.