You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you please book a flight ticket with the name of Shirley Hall?

ASSISTANT: Sure, let me know your source and destination airport codes?

USER: My source and destination points are, Washington, DCA to Phoenix, PHX.

ASSISTANT: Could you please share me your trip dates?

USER: I need to start from Washington on 08/16 attend an interview on 08/17 and intend to return back on 08/18.

ASSISTANT: Ok, Is there any class preference?

USER: Yes, I prefer economy class.

ASSISTANT: Do you need any lay by in between your journey?

USER: Yes, I need a lay by in between journey.

ASSISTANT: thanks for your details, please hold on a minute.

USER: Sure,.

ASSISTANT: Thanks for waiting, we found a Jet Blue airline with fare 300 and a halt in between the journey. Shall I proceed?

USER: My price limit is 200 only, can you provide any discount on airfare?

ASSISTANT: Sorry to inform that, there is no flights found on your price limit.

USER: Ok. no problem. Thank you for your information.

ASSISTANT: Thanks for reaching us, have a nice day.