You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

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: I am glad to help you in changing your reservation.

USER: Thank you.

ASSISTANT: Can you please guide me by providing your name to check the reservation with your name?

USER: Sure, I am Nicole Garcia.

ASSISTANT: I apologise to say this Nicole Garcia, there is no active reservation with your name to change your reservation.

USER: Ok, Thank you for your service.

ASSISTANT: You are welcome, thank you for reaching us. Hope you have a nice day ahead.