You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Can you please book a ticket from DEN to PHX to attend Board meeting?

ASSISTANT: May I know your journey dates?

USER: My journey dates are Feb 19 and Feb 21.

ASSISTANT: Let me know your connection limit.

USER: I want single connected flight.

ASSISTANT: Is there any class preferences.

USER: No.

ASSISTANT: Are you looking for any other help from my side please?

USER: Yes, my depart time should be morning.

ASSISTANT: May I know your good name?

USER: Sure, I am James Mitchell.

ASSISTANT: We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: Ok, no worries. Thank you.

ASSISTANT: Welcome James Mitchell.