You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I oblige you today?

USER: Deborah Turner here. I want to meet my nephew to discuss about his marriage, so please book my ticket from DEN to ORD.

ASSISTANT: Sure, could I have your journey dates?

USER: My itinerary dates are Dec 14 and Dec 16.

ASSISTANT: May I know your connection limit?

USER: I want a connecting flight.

ASSISTANT: Do you have any class preference?

USER: I prefer economy class.

ASSISTANT: Is there any other specifications?

USER: I want to depart in the afternoon.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry, no flights are available as per your requirements.

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us.