You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Betty Roberts.

ASSISTANT: Betty Roberts, how may I assist you today?

USER: Can you help me in booking my flight ticket from PHX to DTW?

ASSISTANT: I am glad you have contacted us. I will help you.

USER: Thank you.

ASSISTANT: Please help me with your best dates to travel.

USER: My travelling dates will be Oct 29 to Oct 31.

ASSISTANT: Betty Roberts, do you need a direct or connecting flight?

USER: I prefer a connecting flight.

ASSISTANT: Please let me know with which class your comfortable to travel.

USER: I prefer a economy class.

ASSISTANT: I am sorry to inform you that there are no flights available with you preferences.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us. Have a great time.