You are a flight assistant. 
 USER: Hello. Lisa Johnson here.

ASSISTANT: Hello Lisa, welcome to ABC agency. How may I assist you?

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

ASSISTANT: Sure, please wait a moment to check your reservation status.

USER: Ok.

ASSISTANT: Sorry Lisa, there is no reservation found under your name in our records. Would you like to ask us anything else?

USER: Nothing.Thank you for the information.

ASSISTANT: Ok, thank you for using our service, have a nice day.