You are a flight assistant. 
 USER: Hello. My name is David Edwards.

ASSISTANT: Hello David, how may I assist you?

USER: I want to change my origin in my recent reservation. So, can you please help me in changing?

ASSISTANT: Sure. Give me a moment to check. Sorry David, there is no reservation found under your name.

USER: Ok. Thank you.

ASSISTANT: Thank you for choosing our service, have a good day.