You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I want to change my reservation due to some health issues. Can you please help me with that?

ASSISTANT: Sure, I am glad to help you in changing the ticket details.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: I am Carol Robinson.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Sorry for the trouble, I have not found any reservation on your name to change the ticket details.

USER: Ok, no problem. Thank you.

ASSISTANT: You are welcome. Thank you for reaching us.