You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Benjamin Wright. Can you aid me to book a flight ticket from LGA to MSP?

ASSISTANT: Sure, can I know your preferable dates?

USER: I would like to travel on 17 Mar and return on 19 Mar.

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

USER: It's ok, not a problem.

ASSISTANT: Thank you.