You are a flight assistant. 
 USER: Hello.

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

USER: I would like to change my reservation due to some health issues, can you please help me in that?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your name to check your previous reservation status?

USER: Myself Kimberly Williams.

ASSISTANT: Ok, please be on hold.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that, we could not find any reservation against your name in our database.

USER: Ok, no problem. Thank you for checking out.

ASSISTANT: Thank you for opting us.