You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you today?

USER: I am Kevin Martinez.

ASSISTANT: Ok.

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

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: We found a reservation with your name, please share your new journey details.

USER: Ok, my trip dates are 01/18 to 01/20. I want to fly from ATL to OAK.

ASSISTANT: We found a Delta airline, flight number: 1020, price: 100 with one connection.

USER: Ok, book the ticket.

ASSISTANT: Your booking is done.

USER: Thanks for your help.

ASSISTANT: Thank you.