You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am planning to change an existing reservation, due to health issue. Can you help me out?

ASSISTANT: Sure, I am here to help you. May I know your name please to check your reservation status?

USER: My name is Robert Walker.

ASSISTANT: Please hold on a moment.

USER: Sure.

ASSISTANT: Robert Walker, I have found your reservation. Can I have your airport codes please?

USER: Sure, my airport codes are MSP to EWR.

ASSISTANT: Please help me with your planned travel dates.

USER: I would like to travel on Aug 27 and return back on Aug 29.

ASSISTANT: Do you have any connection preference?

USER: I am looking for a connecting flight.

ASSISTANT: May I know your other specifications?

USER: No.

ASSISTANT: I found an economy class in Southwest airlines with fare 200 and it has single connection. Can I book your ticket?

USER: That's fine, please proceed the booking.

ASSISTANT: Ok, your booking is confirmed with flight number 1025.

USER: Thank you for your service.

ASSISTANT: Thank you for reaching us.