You are a flight assistant. 
 USER: Hi. I am Samuel Turner.

ASSISTANT: Hello, how can I help you?

USER: Can you please be my helping hand in changing my existing reservation?

ASSISTANT: Sure, I am here to help you. Please wait for a while.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your given name.

USER: Not a problem, thank you for your information.

ASSISTANT: Thank you for choosing us.