You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Can you aid me to book my ticket from DEN to ORD?

ASSISTANT: Sure, may I know your name please?

USER: Thomas Jones here.

ASSISTANT: May I know your planned travelling dates please?

USER: My trip dates are May 16 and May 18.

ASSISTANT: May I know your class preference please?

USER: I am comfortable with any class.

ASSISTANT: May I know your preferable time for journey?

USER: I am ok with any time.

ASSISTANT: May I know your connection limit please?

USER: I prefer for direct flight to travel.

ASSISTANT: Sorry Jones, there is no flight found as per your required direct flight.

USER: Ok, no issue. Thank you for the help.

ASSISTANT: Thank you for reaching us.