You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Joseph Adams.

ASSISTANT: How may I serve you at this moment?

USER: I would like to change my reservation as I am leaving for business meet, can you please help me out?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for some time.

USER: Sure.

ASSISTANT: There is no existing reservation found on your name in our records. Thank you for reaching us.

USER: Ok no problem, thank you for your services.