You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Due to my ill health issue, I would like to change my existing reservation. Will you help me with this?

ASSISTANT: Sure, could you please provide your name to proceed further?

USER: My name is Rachel Carter.

ASSISTANT: Ok, please hold on for a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to say, there is no reservation on your name in my database.

USER: Ok, not an issue. Thank you for providing information.

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