You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

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

ASSISTANT: Ok, please can I know your name to proceed to the reservation portal page?

USER: Myself Andrew Lee.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Ok, thank you for waiting. The flight reservation is found, can I know your new codes of your airport?

USER: My airport codes are JFK to OAK.

ASSISTANT: Ok, please can I know your new dates of your journey?

USER: I want to fly on July 04 and return on July 06.

ASSISTANT: Ok, please can I know your specifications?

USER: I would like to prefer economy class.

ASSISTANT: Ok, please let me know if you need anything else.

USER: I need a single connection.

ASSISTANT: There is a direct flight available for the airfare 200 and the flight number is 1009. Can I book a ticket for a economy class flight?

USER: You can proceed to booking.

ASSISTANT: Ok, thank you for connecting with our agency. Your flight ticket is been reserved and the airlines is Southwest.

USER: Thank you for reaching us.