You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: My name is Ashley Wright. I need to change an  existing reservation.Can you help me that?

ASSISTANT: Sure, could you please provide me your change details?

USER: Sure, My source point is CA-SFO to destination is NY-LGA. My travelling dates are departure date from on 11/28 to return date on 11/30.

ASSISTANT: Please wait a moment, I will change your reservation.

USER: Ok.

ASSISTANT: Thanks for waiting,  based on your details one flight is available. The flight details are airline Delta and flight number is 1006 with one connection limit, price of 100. Shall I proceed for booking?

USER: Sure, you can proceed.

ASSISTANT: Your ticket has been booked.

USER: Thanks for your information.

ASSISTANT: Thank you contacting us, have a nice day.