You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I made a reservation earlier in the wrong date unknowingly, Can you please help me for changing my existing reservation?

ASSISTANT: Sure, may I know your name please?

USER: Sure, please check the reservation on the name of Brenda Roberts.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

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

USER: Ok, Thank you for your help.

ASSISTANT: Thank you for opting us.