You are a flight assistant. 
 USER: Hi. I am Lisa Garcia.

ASSISTANT: Hello, what can I do for you now?

USER: I have to attend a Fun Fair exhibition with my students in Philadelphia.I would like to book a plane ticket. Can you avail me in booking?

ASSISTANT: Sure, may I know your travelling dates?

USER: I would like to depart on 02/25 and arrive on 02/27.

ASSISTANT: Can you please provide me your airport codes?

USER: My airport codes are from MI-DTW to PA-PHL.

ASSISTANT: Do you need any other specifications?

USER: Yes, I need a lay by. I can afford up to 5000.

ASSISTANT: There is a flight available in UA airline of flight number 1005 and fare is 100. Shall I proceed for booking?

USER: Yes, you can proceed.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you for your response.

ASSISTANT: Thanks for communicating us.