You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to cancel my reservation due to some health issues, so please help me to cancel my reservation immediately.

ASSISTANT: Can I have your name please?

USER: Sure, I am Sharon Allen.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: There is no reservation found with your given name.

USER: No issues, thanks for your quick response.

ASSISTANT: Thank you for choosing us.