You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Amy Taylor here.

ASSISTANT: Amy Taylor, I am glad that you have contacted us. How may I assist you with today?

USER: Can you please help me in booking my flight ticket from OAK to visit BOS, as I have a meeting there?

ASSISTANT: Sure, I will help you. Please let me know with your planned travel dates/.

USER: Sure, my travel dates are Apr 2nd and 4th.

ASSISTANT: Amy Taylor, do you need a direct or connecting flight?

USER: I need a connecting flight.

ASSISTANT: Please let me know with your preferred depart and return time.

USER: My depart time must be in the evening. My return should be in the afternoon.

ASSISTANT: Please let me know whether you need a economy or business class flight to travel.

USER: I am comfortable in any class.

ASSISTANT: Amy Taylor, I am really sorry to inform you that there are no active flights available as per your request.

USER: Ok, not a problem.

ASSISTANT: Thank you for understanding.

USER: Anyways, thank you for the information.

ASSISTANT: Thank you for reaching us. Have a wonderful day.