You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Samuel Thomas.

ASSISTANT: How can I assist you?

USER: I am looking for a direct flight, could you please help me with that?

ASSISTANT: Sure Thomas, can I know the travel dates please?

USER: I would like to take off on 10/31 and return on 11/02.

ASSISTANT: Could you please provide the airport codes?

USER: My nearest source airport code is LAS and destination airport code is DEN.

ASSISTANT: Sorry, there are no direct flights available.

USER: That's ok, not an issue.

ASSISTANT: Thank you for approaching us.

USER: Anyways, thank you for the information.