You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Janet Mitchell.

ASSISTANT: How can I help you today?

USER: I need some changes in previous reservation so please help me with changing my reservation.

ASSISTANT: Sure, I can help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment, I will check your previous reservation status.

USER: Sure, take your time.

ASSISTANT: There is no previous reservation available on your name Janet Mitchell.

USER: Oh! May be booking is not done properly. Anyway, thank you for your time.

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

USER: Most welcome.