You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I want to change an existing reservation, so please help me in changing the reservation.

ASSISTANT: Sure, I am glad to help you with that. Can I know your name to check your previous reservation?

USER: Myself Ryan Roberts.

ASSISTANT: I have found your reservation. Can you please provide your travelling dates?

USER: I want to fly on May 17 and return on May 19.

ASSISTANT: Ok, may I know your origin and destination airport codes for booking?

USER: My airport codes are ATL, SEA.

ASSISTANT: Do you have any connection limit?

USER: I need a single connection.

ASSISTANT: Do you have any other specifications?

USER: I would like to depart in the afternoon time.

ASSISTANT: Please be on hold to check the flights.

USER: Ok.

ASSISTANT: I have found a flight with single connection between your journey having with the fare of 100 provided by Spirit airlines in economy class. Are you ok with this flight?

USER: Ok, you can proceed to booking.

ASSISTANT: Ok, your reservation has been successfully changed.

USER: Thank you.

ASSISTANT: Thank you for contacting us.