You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you at this moment?

USER: I need your help right away in booking a flight ticket. Please assist me.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Could you please share your travelling dates?

USER: 28th and 30th of July month are my planned trip dates.

ASSISTANT: Ok, help me with your airport codes.

USER: DTW and PHL are my depart and arrival airport codes.

ASSISTANT: Ok, do you need any lay by in between the journey?

USER: I would prefer to have a break in between journey.

ASSISTANT: Ok, can I have your good name please?

USER: My name is Lisa Evans.

ASSISTANT: Do you have any time preferences?

USER: I am flexible to fly at any time.

ASSISTANT: May I know your class preference?

USER: I would prefer to fly in a economy class flight.

ASSISTANT: There are no flights found on your requested dates. Thank you for reaching us.

USER: Oh! Then I need to go for another agency to book a flight ticket. Thanks for your time.