You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Due to emergency I need to cancel my recent reservation, Can you please help me with thta?

ASSISTANT: Sure, may I know your good name please?

USER: I am Donna Wilson here.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, no reservation found with your name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.