You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Dennis Baker.

ASSISTANT: How can I serve you?

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

ASSISTANT: Sure. Give me a minute.

USER: Sure.

ASSISTANT: Sorry we couldn't find any reservation on your name.

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

ASSISTANT: Thank you for opting us.