You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Sandra Robinson here.

ASSISTANT: How can I assist you today?

USER: Please help me out in booking the ticket from MCO to LAS?

ASSISTANT: Sure, I can help you with that. May I know your planned travel dates please?

USER:  I want to travel on 05/21, and need to catch return flight on 05/23.

ASSISTANT: As per your details, there are no flights available for you on those dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.