You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: This is Emily Thompson.

ASSISTANT: Thanks for providing your name.

USER: I want to change my existing reservation which has done earlier. Please help me In this?

ASSISTANT: Sure, I am here to help you. Please wait a moment.

USER: OK.

ASSISTANT: Thanks for being patient. Sorry there is no reservation found on your name.

USER: OK, thank you for your service.

ASSISTANT: Thanks for connecting us, have a great day.