You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I need to cancel my reservation as my project got ramp down. Will you please help me in cancelling the reservation made by the name Robert Campbell?

ASSISTANT: Sure, I am here to help you out.

USER: Than you.

ASSISTANT: On whose name I want to cancel the ticket?

USER: I am Robert Campbell.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Robert Campbell, we regret to inform you that there is no reservation found on your name in our records.

USER: Ok fine, thanks for your response.

ASSISTANT: Thank you for choosing us.