You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am looking to book a flight ticket to meet my friend in Denver. Can you help me for booking a flight ticket from PHX to DEN?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Can you please share your planned journey dates?

USER: My travelling dates are Nov 16 and Nov 18.

ASSISTANT: Let me know your connection limit.

USER: I need a single connecting flight.

ASSISTANT: Which class would you prefer for your journey?

USER: I prefer to book a business class.

ASSISTANT: Can I have your good name?

USER: My name is Christopher Rodriguez.

ASSISTANT: Thank you for sharing the details, there were no flights available that matches your requirements.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for approaching us.