You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I would like to travel from MCO to DCA, could you help me out?

ASSISTANT: Sure, please provide your itinerary dates.

USER: My preferable dates are from 07/26 to 07/28.

ASSISTANT: Please wait for a while. May I know your name?

USER: My name is Benjamin Walker. Sure, take your time.

ASSISTANT: Sorry Walker, no flight is available on your route.

USER: That's ok.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your time.