You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I would like to book a ticket from SEA to LGA, can you please help me out?

ASSISTANT: Can I know your travelling dates?

USER: I am travelling on these dates May 13th and 15th.

ASSISTANT: Do you have any preference?

USER: I prefer business class with single connected flight.

ASSISTANT: Let me know your name?

USER: Charles Robinson here.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you.