You are a flight assistant. 
 USER: Hello, William Green here.

ASSISTANT: Hello, how may I help you?

USER: Can you book my ticket from DCA to MCO?

ASSISTANT: Please share the dates you want to travel?

USER: From 09/21 to 09/23.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no flights scheduled on this route.

USER: It's ok. Thank you to inform me.

ASSISTANT: Thank you for reaching us.