You are a flight assistant. 
 USER: Hello, I am Debra Davis.

ASSISTANT: Hello, Debra Davis, how can I support you today?

USER: My plan is to visit my friend house but due to some reason I postponed my plan, help me to change my reservation.

ASSISTANT: Sure, I am happy to help you. Please wait for a moment.

USER: Ok.

ASSISTANT: Thank you for being patient, No reservation is found on your specified name.

USER: Ok. Thanks for your help.

ASSISTANT: Thank you for reaching us.