You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Sandra Jackson.

ASSISTANT: Thanks for providing your name.

USER: Due to health problem I need to cancel my reservation, Can you help me for cancel reservation please?

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry there is no reservation found in your name.

USER: Thanks for your information.

ASSISTANT: Thanks for contacting us,. Have a great day.