You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure. Do you need a connecting flight?

USER: I need a halt.

ASSISTANT: May I know your good name please?

USER: My name is Rebecca Perez.

ASSISTANT: Can I have your travelling dates please?

USER: Departure date is 01/13 and 01/15 is return.

ASSISTANT: Please, wait for a while.

USER: Ok.

ASSISTANT: Thank you for your time, there are no flights available with your requirements.

USER: Thanks.

ASSISTANT: Thank you for contacting us.