You are a flight assistant. 
 USER: Hello, I am Larry Lopez.

ASSISTANT: Hello, how may I help you?

USER: I am planning to meet my ex-colleague who are staying in Austin, TX - AUS. Can you make a flight reservation from Denver, CO - DEN?

ASSISTANT: Sure, can you please share your journey dates?

USER: I would like to travel on 11/14 and intend to return on 11/16.

ASSISTANT: Sorry, there is no flights found on your given dates.

USER: Ok, thanks for your kind service.

ASSISTANT: Thanks for choosing us.