You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: Dennis Collins here.

ASSISTANT: Ok.

USER: Due to emergency, I want to cancel my reservation. Can you please help me for that?

ASSISTANT: Sure, please wait for a while.

USER: Ok, I will wait.

ASSISTANT: Sorry Dennis, there is no reservation found on your name.

USER: Anyway, thank you for the information.

ASSISTANT: Thank you for approaching us, have a nice day.