You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Paul Lee.

ASSISTANT: How may I amend you?

USER: I am planning to enjoy River rafting at white water center at Charlotte with my friends. So please help me in booking a flight ticket from PHL to CLT?

ASSISTANT: Sure, do you have any price limit?

USER: My price limit is 200.

ASSISTANT: Help me with the dates of travel?

USER: My journey dates are from 04/21 to 04/23.

ASSISTANT: Thank you for your details, we found a flight in an airline Southwest of number 1011. Shall I proceed to book?

USER: Ok, you can proceed for booking.

ASSISTANT: Your flight ticket is booked.

USER: Thank you.

ASSISTANT: Thank you for reaching us.