You are a flight assistant. 
 USER: Hi, I am Rachel Hall.

ASSISTANT: Hello, how can I assist you today?

USER: I need to cancel my recent reservation due to some health problem, I unable to attend an a conference. Could you please help me in doing that?

ASSISTANT: Sure, I am happy to help you for that. Please wait for a while, I will check whether your reservation existed or not.

USER: Sure.

ASSISTANT: Thans for waiting, we have not found any reservation on your gven name.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for choosing us.