You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I would like o change my destination airport code, please help me in changing my existing reservation.

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Could you please let me know your name to check the reservation list?

USER: My name is George King.

ASSISTANT: Thank you for giving your name, please wait a moment.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, we found a reservation by this name. Please share your updated travelling dates to proceed further.

USER: My planned travel dates are on Apr 20 and Apr 22.

ASSISTANT: Kindly share your boarding and landing airport codes.

USER: My airport codes are MSP to OAK.

ASSISTANT: Do you need a lay by in between your journey?

USER: I prefer a connecting flight.

ASSISTANT: Is there any other preferences that you would like to add before checking?

USER: No more specifications.

ASSISTANT: Thank you for sharing your journey details, please wait a moment.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, we found an economy class ticket providing by UA airline is matching your essential details with the flight number-1002. Shall I book the ticket?

USER: Ok, please proceed for booking.

ASSISTANT: Your ticket has been changed successfully with the connecting flight.

USER: Thank you for your assistance.

ASSISTANT: It's pleasure to serve you. You're welcome.