You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am David Taylor.

ASSISTANT: How can I help you today?

USER: I need to book a flight ticket from MCO to HOU, Can you please help me for booking?

ASSISTANT: Sure, I am glad to help you in booking process. Could you please share your travel dates?

USER: I would like to travel on 02/20 to 02/22.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, no flights are available on your preferable dates.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us, have a nice day.