You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you?

USER: I am Kimberly Johnson. I would like to book a flight ticket from SFO to LGA. Could you please help me out?

ASSISTANT: Sure,can I know your preferable dates?

USER: I am starting on 03/30 and return back on 04/01.

ASSISTANT: I am sorry, there are no flights available.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you, have a good day.