You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Raymond Parker here. Can you help me to book a connecting flight from LAS to ORD?

ASSISTANT: Sure, let me know your travelling dates.

USER: My travelling dates are 28 till 30 of Dec.

ASSISTANT: Can you please share your connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: My class preference is economy.

ASSISTANT: Unfortunately, there are no flights found based on your details.

USER: It's ok, not a problem.

ASSISTANT: Thank you for choosing us.