You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Can you help me in cancelling my reservation, as my exam is postponed?

ASSISTANT: Sure, may I know your name please?

USER: I am David Rodriguez.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: David Rodriguez, I regret to inform that there is no reservation by your name .

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.