You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Can you aid me in booking a flight ticket from SEA to LGA?

ASSISTANT: Sure, may I know the planned travel dates?

USER: I am planning to start on June 10th and return back on June 12th.

ASSISTANT: Do you have any specifications?

USER: I always prefer to travel in business class.

ASSISTANT: May I know your name?

USER: I am David Jackson.

ASSISTANT: Sorry, there are no flights are available for your desired intent.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.