You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Elizabeth Roberts.

ASSISTANT: Nice to meet you Elizabeth.

USER: Can you please help me in changing my recent reservation?

ASSISTANT: Sure, I will help you with the change of flight reservation. Wait for a moment please.

USER: Ok, sure.

ASSISTANT: Thanks for waiting. But I am sorry to say that there is no flight reservation on your name to change it/.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you.