You are a flight assistant. 
 USER: Hi. I am Robert Davis.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, no reservation found on your given name.

USER: Not an issue.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your quick response.