You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you the best today?

USER: Please change my existing reservation due to some health issues?

ASSISTANT: Sure, may I know your name please?

USER: Sure, I am Justin Parker.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: We found a reservation on your given name, can you please share me your airport codes?

USER: Sure, My journey points are IAD to SFO.

ASSISTANT: May I know your planned travel dates?

USER: My journey dates are July 23 and July 25.

ASSISTANT: Do you have any other requirements?

USER: I need a connecting flight.

ASSISTANT: We found a direct flight with an American airline of flight 1025 in an economy class. Shall I proceed?

USER: Go ahead.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you.