You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Please change my existing reservation, due to some health issue.

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

USER: Sure, I am Virginia Harris.

ASSISTANT: Sorry, there is no reservation with your name.

USER: Ok, Thank you for your help.

ASSISTANT: Thank you for reaching us.