You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you for today?

USER: I am Jason Parker. Can you please book a flight ticket to CLT from DCA?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: Planned dates are Dec 16 and Dec 18.

ASSISTANT: Do you have any class preferences?

USER: I prefer economy class to travel.

ASSISTANT: Do you have any airline preferences?

USER: No, I need a single connecting flight.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: My return time should be in the afternoon.

ASSISTANT: Sorry, there are no flights available at your request.

USER: Ok, not an issue. Thank for checking.

ASSISTANT: Thank you for contacting us, have a nice day.