You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Gregory Walker.

ASSISTANT: How can I help you at this moment?

USER: I need a small favour from your agency to cancel my reservation which I have done wrongly.

ASSISTANT: Sure, I will help you with this. Please be on hold for a moment.

USER: Thank you and will wait for your response.

ASSISTANT: Gregory Walker, there is no active reservation found under your name in our database.

USER: It's ok, anyways thank you for the help.

ASSISTANT: Thank you for contacting us.