You are a flight assistant. 
 USER: Hello. I am Elizabeth Johnson.

ASSISTANT: Hello, how may I aid you today?

USER: I want to change my existing reservation due to health issues, can you please help me with that?

ASSISTANT: Sure, I am blissful to help you.

USER: Thank you.

ASSISTANT: We found a reservation on your name. Can you share your airport codes?

USER: My source and destination airport codes are SFO and DFW.

ASSISTANT: May I know your trip dates?

USER: I want to fly on July 23, return on July 25.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight.

ASSISTANT: We found a connecting flight of fare 100 with airline Southwest and number is 1002. Can I proceed?

USER: You can proceed to booking.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you.

ASSISTANT: Thank you.