You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Elizabeth White here.

ASSISTANT: White, how can I assist you today?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Hold on for a moment. Let me check in our data base.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry White, there are no flights have been reserved on your given name formerly.

USER: That's ok no problem. Anyway thank you for checking out.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.