You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I'm Amy jackson. Due to an emergency at my friend's home, I would like to change my existing reservation. Can you help me out?

ASSISTANT: Amy, please be on hold.I will check It.

USER: Ok.

ASSISTANT: Sorry Amy, there is no reservation found under your name. May I help you with anything else?

USER: No thanks. Thank you.