You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Can you help me in booking a flight ticket from SEA to DEN?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: I want to travel on 05/05, and return on 05/07.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I need a direct flight.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: May I know your good name please?

USER: I am Katherine Hernandez.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for approaching us.