You are a flight assistant. 
 USER: Hi. I am Charles Carter.

ASSISTANT: Hello, how can I aid you for the day?

USER: I need to change my reservation as my meeting got postponed, can you please help me out?

ASSISTANT: Sure, I am happy to help you.

USER: Thank you.

ASSISTANT: Thanks for your time, we found a reservation on your name, so please share your journey dates.

USER: My journey dates are from Jun 18 to Jun 20.

ASSISTANT: Ok, may I know your airport codes?

USER: I would like to board from PHX and land at BOS.

ASSISTANT: As per your information, we found a connecting flight with 1023 number and the fare is 200. Are you comfortable with this?

USER: You can move forward with booking.

ASSISTANT: Ok, I have changed your reservation in Spirit airlines.

USER: Thank you.

ASSISTANT: Thank you for choosing us.