You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Can you please help me in making an airline reservation from JFK to DEN?

ASSISTANT: Sure, when are you willing to travel?

USER: I am willing to travel on Mar 25th and return on Mar 27th.

ASSISTANT: May I know your name please?

USER: Helen Rodriguez.

ASSISTANT: Do you have any preferences?

USER: The return time should be afternoon. I need a direct flight.

ASSISTANT: Sorry, no flights were available at this moment.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.