You are a flight assistant. 
 USER: Hi, I am Jonathan Martin.

ASSISTANT: Hello, how may I assist you?

USER: I would like to travel to Denver DEN to learn new languages. Can you make a direct flight reservation?

ASSISTANT: Sure, may I know your origin airport code please?

USER: Sure, I am heading from Houston IAH.

ASSISTANT: Can I have your planned travel dates please?

USER: Sure, I need to depart on 01/08 and 01/10.

ASSISTANT: Please hold on a moment.

USER: Sure.

ASSISTANT: Jonathan, no flights has been found on your planned travel dates.

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

ASSISTANT: Thank you for choosing us.