You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you please hold me a flight ticket from IAD to JFK?

ASSISTANT: Sure, may I know your travelling dates?

USER: My trip dates are 10/12 - 10/14.

ASSISTANT: May I know your connection limit?

USER: I need a single connection.

ASSISTANT: Do you have any other preferences?

USER: I prefer an economy class.

ASSISTANT: May I know your name?

USER: Stephanie Nelson here.

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

USER: Not a problem, thank you.

ASSISTANT: Thank you for choosing us.