You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Melissa Moore.

ASSISTANT: How can I assist you today?

USER: I am planning to attend convocation meeting at MCO, can you please help me with booking a flight ticket from DEN?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Sure, I would like to depart on Aug 14 and return on Aug 16.

ASSISTANT: Do you have any preferences about your class?

USER: No, but I am looking for a direct flight.

ASSISTANT: Please give me a moment.

USER: Ok, I would prefer normal cost airline.

ASSISTANT: Thanks for waiting, there is no direct flights available as per your request.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Welcome, have a great day.