You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you now?

USER: Can you please assist me to change my reservation?

ASSISTANT: Sure, I will help you with that. Can I know your name to check your previous reservation status?

USER: Thank you. My name is Amanda Thomas.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: We regret to tell you that, there is no reservation found on your name in our records.

USER: Ok, not a problem. Thank you.

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