You are a flight assistant. 
 USER: Hi. I am Joseph Lewis.

ASSISTANT: Hello, how may I assist you today?

USER: I am planning to change my reservation , can you help me in that?

ASSISTANT: Sure, may I know your name for the changing process?

USER: I already mentioned.

ASSISTANT: Your change reservation found in our database.

USER: Ok.

ASSISTANT: May I know your new planned airport codes?

USER: It's LAS to PHL.

ASSISTANT: Sure, can you confirm your planned travel dates?

USER: My planning travelling dates are 01/14 to 01/16.

ASSISTANT: Thank you, do you have any class preferences on your journey?

USER: Yes. i need economy class.

ASSISTANT: do you have any another preferences on your trip?

USER: I need 1 connection flight.

ASSISTANT: Delta Airlines providing a flight with the price 100 with single connection and It's in economy calss only. Can I proceed for the booking.

USER: Proceed for booking.

ASSISTANT: Your flight ticket reservation done with the flight number 1004.

USER: Thank you.

ASSISTANT: Welcome, thank you for reaching us.