You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I want to book a ticket from CLT to DEN, can you help me over that?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: Ok, my trip dates are from Apr 20 to 22.

ASSISTANT: Can you please share your connection limit?

USER: I need a flight in business class with single connection.

ASSISTANT: May I know your name please?

USER: Sure, I am Timothy Garcia.

ASSISTANT: Do you have any other specifications?

USER: I need a flight in normal-cost.

ASSISTANT: Timothy Garcia, there are no flights available in your route with your preferences.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for choosing us.