You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you now?

USER: I would like to celebrate my friend's birthday at New York, please help me in booking a ticket from IAD to EWR.

ASSISTANT: Ok, may I know your planned dates?

USER: My planned travel dates are on Feb 1 and Feb 3.

ASSISTANT: Do you need a connecting flight?

USER: I need a connecting flight.

ASSISTANT: May I know your name?

USER: My name is Kevin Walker.

ASSISTANT: No flights are available for your journey.

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

ASSISTANT: Thank you for choosing us.