You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: Due to my health issues I want to cancel my recent reservation. Can you please help me about it?

ASSISTANT: Can I have your name to check whether your reservation is existed or not?

USER: I am Charles Harris.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: Its ok, it might be done by my manager but he did not informed me yet.

ASSISTANT: Ok, thank you for reaching us.

USER: Thank you for the information.