You are a flight assistant. 
 USER: Hello. Myself Frank Hill.

ASSISTANT: Hello. How can I assist you?

USER: I would like to meet my sister at Washington, will you help me in booking the flight ticket from LGA to IAD?

ASSISTANT:   Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My travelling dates are Aug 12 and Aug 14.

ASSISTANT: May I know your connection limit?

USER: I need a flight with single connection.

ASSISTANT:  Do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: Sorry to inform you that no connecting flights were available on your travel dates.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT:  Thank you for availing us.