You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,.

USER: I am Dennis Johnson.

ASSISTANT: How can I support you?

USER: Owing an emergency, I want to cancel my recent reservation. Can you help me in this?

ASSISTANT: Sure, please be on hold.

USER: Ok.

ASSISTANT: Thanks for waiting, we do not found any reservation with your specified name.

USER: Not a problem, thank you for your information.

ASSISTANT: Thanks for approaching us.