You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to book a ticket from Devner CO-DEN to meet my friends.

ASSISTANT: Ok.

USER: Could you please help me in booking?

ASSISTANT: Sure, may I know your journey dates?

USER: I will fly on 10/05 and arrival on 10/07.

ASSISTANT: Kindly, mention your destination airport code.

USER: My destination airport code is Las Vegas NV- LAS.

ASSISTANT: May I know your good name for further process?

USER: I am Emily Nelson.

ASSISTANT: No flights found on your journey locations.

USER: Ok, no issues.

ASSISTANT: Thank you, have a nice day.