You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Emma Williams. Can you help me to change my reservation?

ASSISTANT: Sure, I am here to help you. Wait a minute please.

USER: Sure.

ASSISTANT: Thank you for your time, sorry no reservation found with your name.

USER: Thanks for information.

ASSISTANT: Thank you for reaching us, have a nice day.