You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am Rachel Carter. Can you please help me in changing my recent reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Ok, sure.

ASSISTANT: Sorry, there was no reservation found with your given name.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for opting us.