You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Lisa Smith.

ASSISTANT: How can I help 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 with this?

ASSISTANT: Let me check the reservation status.

USER: Ok.

ASSISTANT: Sorry, no reservation found by your name.

USER: Ok, Thank you for providing information.

ASSISTANT: Thanks.