You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I amend you?

USER: I am Carol Harris and I want to cancel my reservation due to some health problems. Would you help me in this?

ASSISTANT: Sure, let me check the data base and get back to you.

USER: Ok.

ASSISTANT: We could not find any reservation by the name your provided.

USER: No problem. Thank you for your response.

ASSISTANT: Thank you for opting us.