You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Kathleen Harris here. I want to attend my convocation ceremony, so please book my ticket from LAS to ORD.

ASSISTANT: Sure, when do you want to travel?

USER: My itinerary dates are Dec 26 and Dec 28.

ASSISTANT: Ok, May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Ok, Kindly mention your class preference.

USER: I have no preferences. I want to depart in the afternoon.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thank you for your patience, No flights were found with your given requirements.

USER: No problem, thank you.

ASSISTANT: Thank you for availing us.