You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Dennis Hall. I would like to visit the Phoenix Zoo at Phoenix, could you please help me in booking a flight ticket?

ASSISTANT: Sure, we are glad to help you. May I know your source and destination airport codes?

USER: My source is Oakland, CA - OAK and destination code is AZ - PHX.

ASSISTANT: Do you have any preferences?

USER: Yes, I need a halt in between my journey.

ASSISTANT: When do you want to travel?

USER: I want to fly on 04/24 and return on 04/26.

ASSISTANT: There is a flight of Spirit airline, flight number 1002 with the fare of 100.

USER: You can proceed to booking.

ASSISTANT: Your ticket has been reserved.

USER: Thank you for your service.

ASSISTANT: Thank you for reaching us.