You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to attend a meeting at Seattle, please help me in booking a ticket from IAD to SEA.

ASSISTANT: Could you please help me with your travelling dates?

USER: My planned journey dates are on Oct 4 and Oct 6.

ASSISTANT: Do you have any other preferences?

USER: I prefer a business class for my trip.

ASSISTANT: Can I know your connection limit?

USER: I need a flight with single connection.

ASSISTANT: May I know your name?

USER: My name is Betty Harris.

ASSISTANT: Sorry, there are no flights available on your travelling dates.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for choosing us.