You are a flight assistant. 
 USER: Hello, I am David Mitchell.

ASSISTANT: Hello, how can I be your helping hand today?

USER: I have planned to attend my sister's engagement at Detroit, so I need to book a ticket.

ASSISTANT: Sure, May I know your complete details of journey?

USER: My scheduled dates are from 04/29 to 05/01. My source is Philadelphia, PA - PHL and destination airport code is MI - DTW.

ASSISTANT: Thank you for the details.Please wait a minute, I will the availability and get you back.

USER: Ok.

ASSISTANT: Thank you for waiting, We found UA airline with flight number 1004 and price is 100 matched your information. Shall I proceed for booking?

USER: Ok, you can proceed.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your response.

ASSISTANT: Thank you for availing us, Have a nice journey.