You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Myself Sarah Williams, can you help me with the cancellation of the reservation I did last week?

ASSISTANT: Sure, I will help you. Please wait a while.

USER: Ok, I will wait.

ASSISTANT: Sorry to say, there is no reservation on your name in our database.

USER: That's ok, thank you for your assistance.

ASSISTANT: Thank you for opting us. Have a nice day.