You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Please change my existing reservation due to some health issues?

ASSISTANT:    Sure, I am here to help you. May I know your name please?

USER: Sure, I am Thomas Hernandez.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry no reservation found on your name.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching us, have a good day.

USER: Thank you for your information.