You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Pamela Carter. Owing to an emergency , I want to change an existing reservation.

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name.

USER: No problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you.