You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my existing reservation. Can you please help me in that?

ASSISTANT: Yes, can you tell me your name?

USER: Carolyn Martinez here.

ASSISTANT: I have found reservation on your name. Can you share me your dates of travel?

USER: My trip dates are Jan 25 to Jan 27.

ASSISTANT: Can you share me your new airport codes?

USER: My preferred airport codes are LGA to EWR.

ASSISTANT: Do you have any preferences?

USER: I prefer to travel in connecting flight.

ASSISTANT: I have found an economy class ticket with a price of 200 and 1 connection.

USER: You can proceed.

ASSISTANT: Your ticket has been booked.

USER: Thank you for availing us.

ASSISTANT: Thank you for reaching us.