You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Alexander Wilson. I would like to change my existing flight ticket. Could you please help me out?

ASSISTANT: Sure, please hold on for a moment, let me check.

USER: Take your time.

ASSISTANT: Sure, can I know your preferable dates?

USER: I am planning to start on 07/08 and return back 07/10.

ASSISTANT: Can I know your airport codes?

USER: From SEA to PHX.

ASSISTANT: Your ticket is booked with UA airlines flight 1025.

USER: Thank you for the help.

ASSISTANT: Thank you, have a good day.