You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am planning to celebrate my birthday in Chicago, so please book a flight ticket from DEN to ORD.

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: I will start on Oct 13, return on Oct 15.

ASSISTANT: Can I have your good name please?

USER: My name is Janet Hill.

ASSISTANT: May I know your class and airline preference please?

USER: I want a economy class.

ASSISTANT: Please let me know if you have any other specifications.

USER: I want a flight with one connection.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates with your given details.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.