You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

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

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

USER: Sure, Carolyn Taylor here.

ASSISTANT: Please wait a moment.

USER: Sure.

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

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching to our services, hope you have a great day.