You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

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

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

USER: Myself Brenda Walker.

ASSISTANT: Please be on hold.

USER: OK.

ASSISTANT: There is no reservation found under your name, Walker.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for choosing us.