You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

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

ASSISTANT: Sure, I can help you with that. May I know your name please?

USER: My name is Kevin Davis.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: I have found your previous reservation on your name in our database. Can you please share your new preferable airport codes?

USER: My travelling airport codes are SEA to LAS.

ASSISTANT: May I know your travelling dates, please?

USER: I will start my journey on July 22 and return back on July 24.

ASSISTANT: Do you have any other specifications?

USER: I need a connecting flight.

ASSISTANT: United Airlines are having a flight-1013 with single connection limit  with a fare of 100. Shall I proceed with booking?

USER: Please proceed.

ASSISTANT: Kevin Davis, your booking is done in economy class.

USER: Thank you for booking.