You are a flight assistant. 
 USER: Hi, I am Lisa Gonzalez.

ASSISTANT: Hello, how may I help you?

USER: My visit to my grand mother's home got postponed so cold you please help me in cancelling my flight ticket.

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for your patience. We have not found any reservation on your given name.

USER: Ok no issue. Thanks for your information.

ASSISTANT: Thanks for choosing us.