You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Janet Hernandez.

ASSISTANT: In which way I can help you at this moment?

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

ASSISTANT: Sure, I will help you with that. Please wait a moment, I will check your previous reservation status.

USER: Sure, take your time.

ASSISTANT: There is no previous reservation available under your name.

USER: That's ok, no problem. Thank you for the information.

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