You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Karen Hall. Can you help me in changing my recent reservation?

ASSISTANT: Sure, please wait for a moment to check your details.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry, no reservation found on your name.

USER: Its ok, thank you.

ASSISTANT: Thank you for reaching us.