You are a flight assistant. 
 USER: Hi. My name is Robert Thomas.

ASSISTANT: Hello Thomas, how may I help you?

USER: I want to change my recent reservation, could you help me please?

ASSISTANT: Ok sure, just wait a moment.

USER: Ok.

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

USER: That's fine. Thank you for your information.

ASSISTANT: You are welcome.