You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Mary Anderson here.

ASSISTANT: How can I aid you at this moment?

USER: I would like to change my reservation which I have done long ago. Because, have done that reservation with wrong destination. Can you please help me about it?

ASSISTANT: Sure, I can aid you with that.

USER: Thank you.

ASSISTANT: Ok, please wait a moment.

USER: Sure, take your time.

ASSISTANT: There is no previous reservation available in your name Mary Anderson.

USER: Oh! I think the ticket was not booked properly while I am booking. Anyway, thank you for the information.

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

USER: Welcome.