You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I want to change my existing reservation due to some health issue. Can you please help me in that?

ASSISTANT: Sure, I am here to aid you. Please mention your good name to proceed further.

USER: Myself Joshua Williams.

ASSISTANT: Ok, please wait for a moment, I will check the status and get back to you.

USER: Ok.

ASSISTANT: Thank you for waiting, There was no reservation found on your given name.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Thank you for opting us.