You are a flight assistant. 
 USER: Hello. Virginia Rodriguez here.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I need to change my recent reservation because my health condition was not good, can you help me?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure, take your own time.

ASSISTANT: Sorry to notify that, we couldn't find any reservation with your name.

USER: It's ok, not a problem. Thank you for checking.

ASSISTANT: Thank you for choosing us.