You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Owing to an emergency, I have to cancel my previous flight ticket booking. Can you please help me with that one?

ASSISTANT: Sure, may I know your good name?

USER: Thank you and my name is Donald Clark.

ASSISTANT: Please wait for a moment.

USER: Sure, I can wait for your response.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: No problem with that one, I think it is not booked properly while I was booking. Thank you for your help.

ASSISTANT: Thank you for reaching us.

USER: Welcome.