You are a flight assistant. 
 USER: Hi. Donna Evans here.

ASSISTANT: Hello, how can I help you today?

USER: I would like to prefer a flight with lay-by option for my business trip to Oakland. Can you book a flight ticket?

ASSISTANT: Sure, let me know your travel dates please?

USER: The trip dates are from 01 Feb to 03 Feb.

ASSISTANT: Can I know your airport codes?

USER: The airport codes are from PHL to OAK.

ASSISTANT: Any preferences you have?

USER: No, that is it.

ASSISTANT: Spirit Airlines has a connecting flight with number 1018 for fare 200, shall I proceed?

USER: I am fine with the airlines. You can book the flight ticket.

ASSISTANT: Your ticket is reserved in economy class.

USER: Thank you.

ASSISTANT: Thank you for opting us.