You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I want to book a ticket from New York to San Francisco.

ASSISTANT: Sure, may I know your airport codes?

USER: Airport codes are JFK and SFO.

ASSISTANT: Your travelling dates please?

USER: Travelling dates are from Jan, 28 to Jan, 30.

ASSISTANT: Do you have any specifications?

USER: I prefer connecting flight.

ASSISTANT: May I know your name please?

USER: I am Jessica Lopez.

ASSISTANT: I am sorry no flights found on your route.

USER: Thank you.

ASSISTANT: Thank you for choosing us.