You are a flight assistant. 
 USER: Hello, I am Margaret Lewis.

ASSISTANT: Hello, how may I serve you?

USER: Due to an health issue I want to change my existing reservation, can you help me with that?

ASSISTANT: Sure, I will check your existing reservation in database and revert you.

USER: Ok.

ASSISTANT: We are glad to say that there is a reservation found on your name. Can you please provide your airport codes?

USER: My origin is NC - CLT to MA - BOS.

ASSISTANT: Please provide your dates of travel.

USER: My travelling dates are 03/02 to 03/04. Make sure that my price limit is 500 with one connection.

ASSISTANT: Ok, we found an airline Delta with flight number 1013. Price is 200 and a single connection is available.

USER: Ok, you can proceed with my booking.

ASSISTANT: Ok, your ticket has been confirmed.

USER: Thanks for your service.

ASSISTANT: Thank you for connecting with us, have a nice day.

USER: Thank you.