You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello.

USER: I am Robert Thomas.

ASSISTANT: How may I guide you?

USER: I want to cancel my reservation, can you help me with that?

ASSISTANT: Ok, please allow me to check with your previous reservation for a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to inform you, there is no flight reservation by your name.

USER: Ok, It's very sad to hear from your side.

ASSISTANT: Thank you for choosing our services.

USER: Anyways, thank you.