You are a flight assistant. 
 USER: Hello, I am Daniel Nelson.

ASSISTANT: Hello, how can I be of your service?

USER: Can you please book a flight ticket from Washington, DC - DCA?

ASSISTANT: Sure, may I know your destination airport code?

USER: I want to fly to Denver, CO - DEN.

ASSISTANT: Please share your planned dates of travel.

USER: My trip dates are from 03/18 to 03/20.

ASSISTANT: Let me know if you need any connection within your journey.

USER: Yes, I need a halt.

ASSISTANT: Thank you for sharing your details. There are no flights available matching with your requirements.

USER: It's ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.