You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to change my existing reservation due to bad health issues. can you help me out?

ASSISTANT: Sure, may I know your name?

USER: I am Virginia Williams.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for opting us.