You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I am planning to book a ticket from PHX to ORD. Can you please help out?

ASSISTANT: Sure, I will help you with that. Can you please provide your preferable departure and return dates of travelling?

USER: I would like to travel on Mar 20 and return back on Mar 22.

ASSISTANT: Do you have any connection limit?

USER: I am looking for a connecting flight.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: My depart time should be evening.

ASSISTANT: May I know your name to book the flight ticket?

USER: My name is Scott Lee.

ASSISTANT: Any other preferences do you have?

USER: No.

ASSISTANT: Please wait a moment to check the flights.

USER: Sure.

ASSISTANT: We regret to inform you that, there are no flights available for your journey with your requested dates of travelling.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for reaching us, hope you have a great day.