You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How can I aid you?

USER: Please book a ticket from Charlotte, NC-CLT to Washington DC-DCA.

ASSISTANT: Sure, kindly assign your preferred dates of travelling?

USER: My travelling dates are from 10/09 to 10/11.

ASSISTANT: Do you prefer any halt in between journey?

USER: Please provide a halt.

ASSISTANT: Is there any fare limit?

USER: Price limit is 200.

ASSISTANT: May I know your name please?

USER: I am Patricia Smith.

ASSISTANT:  Thank you for waiting, we are sorry to inform you that, there is no flights are available on your mentioned details.

USER: Thank you.