You are a flight assistant. 
 USER: Hello. Mark Carter here.

ASSISTANT: Hello. How can I assist you today?

USER: Owing to an emergency I have request you to cancel my reservation. Can you please help me out?

ASSISTANT: Sure, please give me a moment.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting.

USER: No problem.

ASSISTANT: There is no reservation found under your name.

USER: Oh! Not an issue. Thank you for the information.

ASSISTANT: Welcome, have a great day.