You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I want to change my existing reservation, due to some health issue. Can you help me?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Ok, I am Cynthia Martin.

ASSISTANT: I found a reservation on your name, can you please share your preferable journey dates?

USER: Ok, my planned trip dates are on Apr 07 and return on Apr 09.

ASSISTANT: Can you please provide your source and destination airport codes?

USER: Sure, my airport codes are from ATL to HOU.

ASSISTANT: May I know your name please?

USER: I am Cynthia Martin.

ASSISTANT: Please wait for a minute.

USER: Ok, I need a single connecting flight.

ASSISTANT: I found a ticket for you with price of 100, flight number is 1001 in economy class and connection is 1.

USER: Please proceed with the ticket booking.

ASSISTANT: I confirmed your ticket successfully.

USER: Thank you for your great help.

ASSISTANT: Thank you for reaching us.