You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I Help you?

USER: Would you please help me to change the existing reservation on the name of Carolyn King?

ASSISTANT: Please wait a moment, I will check the reservation is there are not.

USER: Ok.

ASSISTANT: Thanks for waiting, we found a reservation on your name, could you please provide me your new travelling details?

USER: Ok, I like to fly from WA - SEA on 05/21 to PA - PHL on 05/23.

ASSISTANT: Thanks for providing your details, as for your details we found a flight. Shall I proceed for booking?

USER: Please provide me flight details.

ASSISTANT: Sure, airline UA, airline number is 1010 and one connection limit with price of 100.

USER: Ok, now you can proceed.

ASSISTANT: Your ticket has been booked.

USER: Ok, thanks for your service.

ASSISTANT: Thank you choosing us, have a grate day.