You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me in booking a flight ticket to PHX from DEN?

ASSISTANT: Sure, I can help you. May I know your itinerary dates?

USER: My travel dates are from Nov 23 to Nov 25.

ASSISTANT: Do you prefer a direct or connecting flight?

USER: I prefer to travel in connecting flight.

ASSISTANT: Do you prefer economy or business class?

USER: I need a business class.

ASSISTANT: In which airlines do you prefer to travel?

USER: I am comfortable with any airline.

ASSISTANT: Do you prefer any specific timings to travel?

USER: No.

ASSISTANT: May I know your name?

USER: I am Deborah Anderson.

ASSISTANT: Sorry Deborah Anderson, no flights are available as per your requirements.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you.

ASSISTANT: Welcome.