You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Stephen Nelson, can you help me to cancel the reservation I did recently?

ASSISTANT: Sure, I am here to help you. Hold on for a moment. Let me check.

USER: Ok, I will wait.

ASSISTANT: Sorry Nelson, there are no flights reserved on your given name.

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

ASSISTANT: Welcome, thank you for choosing us. Have a great day.