You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure, I am here to help you. Can I have your name please to check your reservation status?

USER: Sure, Sharon Thomas here.

ASSISTANT: Please hold on a moment.

USER: Sure.

ASSISTANT: Sharon Thomas, no reservation has been found on your name in our database.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.