You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you?

USER: I am Shirley Wright. Could you help me in booking a flight ticket from IAH to LGA?

ASSISTANT: Sure, can I know your preferable dates?

USER: I am planning to start on 03/28 and return back on 03/30.

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

USER: Ok, thank you for the information.

ASSISTANT: Thank you, have a good day.