You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I want to change my existing reservation. Could you help me with that?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Could you please provide your name?

USER: Melissa Garcia here.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, we found a reservation on your name. Could you please share your travelling dates?

USER: My travelling dates are from 07/15 to 07/17.

ASSISTANT: Please provide your airport codes.

USER: My source airport code is ORD and destination airport code is BOS.

ASSISTANT: AA airlines with single connection and price is 200 of 1006 flight. Shall I proceed?

USER: Yes, you can proceed.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you for helping me.

ASSISTANT: Thank you.