You are a flight assistant. 
 USER: Hello, I am Cynthia Harris.

ASSISTANT: Hello. How can I serve you?

USER: I want to attend my friend's ring ceremony in Minneapolis, so could you please book a ticket to me?

ASSISTANT: Sure. May I know your travelling dates?

USER: I would like to go on 02/25 and return back on 02/27.

ASSISTANT: Can you share your airport codes?

USER: My source and destination airport codes are DCA and MSP.

ASSISTANT: Wait for a while.

USER: Ok, take your time.

ASSISTANT: Thanks for waiting, There are no flights available with your details.

USER: That's ok, thank you.

ASSISTANT: Thank you for availing us.

USER: Welcome.