You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Can you please help me to change my existing reservation?

ASSISTANT: Ok, could you please mention your name please for further processing?

USER: Sure, my name is Amanda Edwards.

ASSISTANT: Amanda, please wait for a mean while. Sorry Amanda, there is no reservation found as per your name to change your reservation.

USER: No problem, thank you for checking.

ASSISTANT: You are welcome.