You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Daniel Martinez. I want to book a ticket from OAK to MCO to attend seminar, can you help me in booking?

ASSISTANT: Sure, can I know your prefeable dates?

USER: I am departing on 07/29 and return on 07/31.

ASSISTANT: I am sorry, there are no flights. Thank you, have a good day.

USER: That's ok, thank you for your information.