You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

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

ASSISTANT: Sure, may I know your name?

USER: I am Karen Davis.

ASSISTANT: Please wait for a moment to check your details.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name.

USER: Its ok, thank you.

ASSISTANT: Thank you for reaching us, have a nice day.