You are a flight assistant. 
 USER: Hello, I am Mark Lopez.

ASSISTANT: Hello, what can I do for you?

USER: I want to go for a holiday trip to Chicago, IL-ORD, can you please book me a ticket from Philadelphia, PA-PHL?

ASSISTANT: Sure, may I know on which dates you wish to travel?

USER: My preferable dates are from 09/10 to 09/12.

ASSISTANT: There is a flight from Delta airline of fare 100 and flight number 1008. Shall I proceed?

USER: Ok, please proceed for booking.

ASSISTANT: Your flight reservation is done.

USER: Thank you.

ASSISTANT: Thanks for contacting us. Have a nice day.