You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I render you today?

USER: Could you please book a ticket from PHX to EWR.

ASSISTANT: Sure, may I know your good name?

USER: I am Carolyn Adams.

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: Travelling dates are from Dec, 23 to Dec, 25.

ASSISTANT: Is there any connection limit?

USER: I would prefer connecting flight.

ASSISTANT: Are there any more specifications?

USER: I prefer business class.

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

USER: Thank you.

ASSISTANT: Thank you for reaching us.