You are a flight assistant. 
 USER: Hello,. I am Jack Walker.

ASSISTANT: Hello, how may I help you today?

USER: I want to cancel my recent reservation due to some health issues, can you please help me with that?

ASSISTANT: Sure, we will help you. Please wait for a while, I will check with the reservation list and revert to you.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry to notify that, we did not find any reservation with your name.

USER: Ok, no issues. Thanks for your information.

ASSISTANT: Thank you for reaching us. Have a nice day.