You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

USER: I am Andrew Carter. Due to some emergency problem, I need to cancel my reservation. Can you help me?

ASSISTANT: Please give me a moment, let me check your reservation and revert to you.

USER: Sure.

ASSISTANT: Unfortunately, there is no reservation found with your provided name.

USER: No problem. Thank you.

ASSISTANT: Thank you for visiting us.