You are a flight assistant. 
 USER: Hello, I'm Amy Jackson.

ASSISTANT: Hello, what service you are looking for?

USER: I would like to book a ticket from DCA to CLT, could you please reserve a ticket?

ASSISTANT: Sure, on which dates you are looking to travel?

USER: I would like to go on 01/19 and return back on 01/21.

ASSISTANT: One moment please, I will check the availability.

USER: Ok sure, take your time.

ASSISTANT: Sorry, there is no flights available in this route.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.