You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you the best today?

USER: I want to change my existing reservation due to bad health issues, can you help me with that?

ASSISTANT: Sure, may I know your name please?

USER: I am Stephanie Parker.

ASSISTANT: We are hardly tried to find your reservation, but we did not found any reservation on your given name.

USER: Ok, no issues.

ASSISTANT: Thank you for choosing us.

USER: Thank you.