You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sarah Garcia.

ASSISTANT: Sarah Garcia, how may I assist you with today?

USER: Due to sudden work, I need to change my reservation. Can you please help me with it?

ASSISTANT: I will try to help you with it. Please allow me a minute.

USER: Ok.

ASSISTANT: Thank you. I notice that there is no active reservation booked on your name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us. Have a great day.