You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: My name is Barbara White.

ASSISTANT: How may I assist you?

USER: I am not feeling well, please help me to change my recent reservation.

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please hold on a moment, I will check the status of your reservation.

USER: Sure.

ASSISTANT: Barbara White, no reservation has been found on your name in our database.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for approaching us.