You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: Sure, can I know your name please?

USER: I am Jessica Williams.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Its ok, thank you.

ASSISTANT: Thank you for approaching us.