You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Amy Campbell here.

ASSISTANT: Amy, how can I assist you?

USER: I have planned to visit my friends for giving a sudden surprise.But unfortunately, they are went to another place. So I want to change my reservation.Can you please help me for that?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, no reservation found by your name.

USER: Any way, thank you for the information.

ASSISTANT: Thank you for contacting us.