You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Myself Dennis Lee. Due to some health issue, I want to cancel my recent reservation. Can you please help me?

ASSISTANT: So sad to hear this, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no ticket showing on your name.

USER: Thank you for the information.

ASSISTANT: Thank you for reaching us.