You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you help me to book a flight ticket from SEA to LAS?

ASSISTANT: Can I have your journey dates?

USER: My trip dates are 20 and 22 of Feb.

ASSISTANT: Do you need any connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any other specifications to be met?

USER: I prefer to travel in business class and return in the evening.

ASSISTANT: May I know your name?

USER: I am Susan Collins.

ASSISTANT: There are no flights available on your required dates.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for choosing us.