You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I need to book a ticket from Phoenix to Detroit.

ASSISTANT: Yes, can you share me your travelling dates?

USER: Travelling dates are from Jan, 24 to Jan, 26.

ASSISTANT: Can you tell me your nearest airport codes?

USER: Airport codes are PHX to DTW.

ASSISTANT: Do you have any preferences?

USER: I would like to prefer business class.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requested criteria.

USER: Thank you.

ASSISTANT: Can I know your name?

USER: My name is Susan Mitchell.

ASSISTANT: Thank you for contacting us.