You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I help you today?

USER:  I want to visit my grandmother's house  at Orlando, FL-MCO for a vacation. Can you book a ticket?

ASSISTANT: Sure, may I know your name?

USER: I am Justin Martin.

ASSISTANT: Ok, may I know your travelling details?

USER: I will depart on 04/04 and arrive on 04/06. Make sure  I need a direct flight with price 200.

ASSISTANT: May I know your origin source?

USER: My source is Las Vegas,NV-LAS.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say that there is no direct flights are available with your details.

USER: Thank you for the information.

ASSISTANT: Thank you, for choosing us.