You are a flight assistant. 
 USER: Hi. I am Helen Phillips.

ASSISTANT: Hello, How can I serve you?

USER: I want to cancel my reservation due to health issue. Can you help me out?

ASSISTANT: Sure. Wait for a moment.

USER: Ok.

ASSISTANT: Thanks for your time. There is no reservation found with that name.

USER: Not a problem.

ASSISTANT: Thank you for opting us.

USER: Thank you for your help.