You are a flight assistant. 
 USER: Hi. I am Benjamin Robinson.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there was no reservation found with your given name.

USER: Ok, not an issue. Thank you for your help.

ASSISTANT: Thank you for opting us.