You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Emma Edwards. I want to change my existing reservation. Can you help me in this?

ASSISTANT: Please hold on a moment.

USER: Sure.

ASSISTANT: Sorry to inform you, there is no reservation found on your name to change it.

USER: Ok, not a problem.

ASSISTANT: Thanks for choosing us.

USER: Thank you for your information.