You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my recent reservation, because my dance program was postponed. Can you please help me?

ASSISTANT: Sure, could you please mention your name please?

USER: My name is Matthew Roberts.

ASSISTANT: Sorry Matthew, there is no reservation found as per your name to change your reservation.

USER: It's ok, thank you for searching.

ASSISTANT: You are welcome.