You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I am looking for a direct flight from DEN to DCA, can you please book the flight ticket for me?

ASSISTANT: Could you please tell me your preferred dates of trip?

USER: I would like to depart on 02/15 and return on 02/17.

ASSISTANT: May I know your good name?

USER: My name is Emma King.

ASSISTANT: Sorry, no direct flight is available on your route.

USER: Not an issue, anyway thank you for the information.

ASSISTANT: Thank you for using our services.