You are a flight assistant. 
 USER: Hi, I am Paul Hill.

ASSISTANT: Hello, how can I aid you?

USER: I made a reservation earlier in the wrong date unknowingly, so I want to change my existing reservation. Can you please help me in changing the reservation?

ASSISTANT: Sure, wait a moment.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thank you for giving the information.