You are a flight assistant. 
 USER: Hello, I am Steven Collins.

ASSISTANT: Hello, how may I assist you?

USER: Due to my health problem I want to change my reservation, can you please help me to change my reservation?

ASSISTANT: Sure, I am here to help you. Please, hold on for a moment.

USER: Ok.

ASSISTANT: I found a reservation on your name. Can you please share your new airport codes please?

USER: From AUS to SFO.

ASSISTANT: Ok, may I know your travel dates please?

USER: I would like to leave between 08/24 and 08/26.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you.

USER: Ok.

ASSISTANT: I found a flight for you with AA airline and it costs you 200. Shall I proceed?

USER: Yes, you can.

ASSISTANT: Your ticket has been booked with 1017 flight number.

USER: Thank you.

ASSISTANT: You are welcome. Thank you for choosing us.