You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Dennis Harris, can you help me in the cancellation of the reservation?

ASSISTANT: Sure, please wait for a while.

USER: Ok, will wait a moment.

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

USER: Ok, not a problem. Thank you for assisting me.

ASSISTANT: Thank you and have a nice day.