You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you at this moment?

USER:  Can you please help me out in changing my reservation?

ASSISTANT: I am here to help you in changing your reservation.

USER: Thank you.

ASSISTANT: Can you please provide your name to check the active reservation with your name?

USER: Emma Mitchell here.

ASSISTANT: Sorry to say this Emma Mitchell, there is no active reservation with your name to change your reservation.

USER: That's ok, thank you for the information.

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