You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am planning to change an existing reservation, due to health issue. Can you please help me out to change my reservation?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name to check your previous reservation status?

USER: I am Kathleen Rodriguez.

ASSISTANT: Ok, please give me a moment.

USER: Sure, I will wait for your reply.

ASSISTANT: Sorry, there is no reservation found on your name in our records to modify.

USER: That's fine, thank you you for your help.

ASSISTANT: Thank you for reaching us.