You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: Would it be possible to change my reservation to new travelling dates?

ASSISTANT: Yes, can you tell me your name?

USER: Sure, I am Anthony Miller.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for contacting us.