You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you?

USER: Susan Nelson here. Can you book me a ticket from DCA to MCO?

ASSISTANT: Sure, can I know your preferable dates?

USER: Ok, I would like to travel on 11/16 and 11/18.

ASSISTANT: I am sorry, there are no flights.

USER: No issues, thank you for the help.

ASSISTANT: Thank you.