You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you for today?

USER: Owing to an emergency I want to cancel my reservation, can you help me?

ASSISTANT: Sure, may I know your name please?

USER: Myself Matthew Clark.

ASSISTANT: Ok, Wait for a while. I will check the details and get back to you.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry Clark, there is no reservation found on your name.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: Welcome.