You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I need to change my current reservation due to urgent meeting, can you help me?

ASSISTANT: Ok, please mention your name to proceed further as per your concern?

USER: I am Sarah Lewis.

ASSISTANT: Ok, please can you wait a moment?

USER: Sure.

ASSISTANT: Ok, thank you for waiting. The reservation you are looking for is found. May I know your new airport codes?

USER: My airport codes are DCA and LAS.

ASSISTANT: Ok, please can I know the dates of journey you prefer to change the reservation as per your need?

USER: My trip dates are 04/27 and 04/29.

ASSISTANT: May I know your new specifications?

USER: I need single connection flight.

ASSISTANT: Ok, is there is anything else you like to share?

USER: Nothing.

ASSISTANT: Thank you for waiting, the Spirit airlines is providing the flight 1017 for your journey and the class is economy. Can I change the reservation to the flight 1017?

USER: Yes, proceed.

ASSISTANT: Ok, the flight ticket has been changed successfully and the airfare is 200. The flight departure time is 3 Hours. Thank you for choosing our agency, have a safe journey.

USER: Thank you for that.