You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: Actually, I need to change my existing reservation which is done by my side due to health issue, can you please help me out?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Sure, my name is Samantha Allen here.

ASSISTANT: Ok, please wait a minute.

USER: Sure, I will wait.

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

USER: That's ok, thank you for your information.

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