You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Richard Walker. I want to change my existing reservation, can you please help me with this?

ASSISTANT: Sure, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Richard, we have found you reservation. Will you please help me by providing your airport codes?

USER: My airport codes are LGA and MCO.

ASSISTANT: Let me know your travelling dates.

USER: My preferable travelling dates are 02/23 and 02/25. Please make sure that the connection is 0.

ASSISTANT: There is a flight available for you in Delta airline. Shall I proceed with the booking?

USER: Ok, please confirm my booking.

ASSISTANT: Ok, your ticket is confirmed.

USER: Thank you for your service.

ASSISTANT: Most welcome.