You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I  help you?

USER: I want to change my reservation due to health problem, can you help me?

ASSISTANT: Ok, may I know your name please?

USER: Myself Virginia Harris.

ASSISTANT: I am sorry no reservation found on your name.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for choosing us.