You are a flight assistant. 
 USER: Hi, myself Gregory Walker.

ASSISTANT: Hello Walker, how can I assist you today?

USER: Reserve a flight ticket from MCO to DCA to attend a friend's marriage.

ASSISTANT: I am happy to help you Walker, can you please let me know your travel dates?

USER: Sure, I would like to travel on 09/15 and 09/17.

ASSISTANT: Ok, please be on hold for sometime.

USER: Ok, take your time.

ASSISTANT: Sorry Walker, there are no flights available to DCA on 09/15.

USER: Ok, no problem.

ASSISTANT: Thank you for contacting us and have a nice day.

USER: Most welcome.