You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand?

USER: I am Samuel Thomas. I want to change my reservation due to office work that my manager did not approved my leaves, so can you please change it?

ASSISTANT: Sure. Please, wait for a while.

USER: Sure.

ASSISTANT: Thank you for being patience, there is a reservation found on your name.

USER: Ok.

ASSISTANT: Please share your new journey details.

USER: Journey dates are 10/31 to 11/02. Airport codes are DTW to LAX.

ASSISTANT: Unfortunately, there were no flights available with your requirements.

USER: No problem. Thank you.

ASSISTANT: Thank you for approaching us.