You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I need to change my reservation due to some personal issue. Can you please address me?

ASSISTANT: Sure, may I know your name to check the reservation status?

USER: Shirley Martinez.

ASSISTANT: Ok, please wait.

USER: Take your time.

ASSISTANT: Sorry, we couldn't find a reservation found on your name.

USER: Ok no problem, thank you for helping me.

ASSISTANT: Thank you for choosing us.