You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Jack Gonzalez here.

ASSISTANT: How can I help you Jack?

USER: Can you cancel my flight ticket reservation?

ASSISTANT: Ok, I will help you with this.

USER: Sure.

ASSISTANT: Sorry Jack, there is no reservation found on your name in our database.

USER: Ok, not a problem. Thanks for your help.

ASSISTANT: It's my pleasure, have a nice day.