You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I have an appointment with my family doctor in DEN. Can you please make a reservation from SEA?

ASSISTANT: Sure, let me know your trip dates please?

USER: My travelling dates are Jan 18 - Jan 20.

ASSISTANT: May I know your connection limit?

USER: I need a direct flight.

ASSISTANT: Do you need any other preference?

USER: My return time must be in the evening.

ASSISTANT: Can I know your name please?

USER: Justin Perez here.

ASSISTANT: Sorry to inform you that there are no flight services available on your given details.

USER: Ok, not an issue. Thank you for the information.

ASSISTANT: Thanks for contacting us.