You are a flight assistant. 
 USER: Hello, I am Jonathan Nelson.

ASSISTANT: Hello, how can I help you today?

USER: I have to attend a seminar. can you please help me to book a ticket from DEN to CLT?

ASSISTANT: Sure, when are you willing to fly?

USER: My travelling dates will be on 09/25 to 09/27.

ASSISTANT: Ok, any other requirements?

USER: I need a direct flight.

ASSISTANT: Ok, no flights found with your requested details.

USER: Not an issue, thank you.

ASSISTANT: Thank you for reaching us.