You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am David Jackson.

ASSISTANT: How may I aid you at this moment?

USER: I want to cancel my recent reservation due to some health issues. Can you please help me?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: There is no active reservation found on your name in our records.

USER: Ok, no issues.

ASSISTANT: Thank you for opting us.

USER: Thank you.