You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: May I know is the change of my reservation possible as I did recently?

ASSISTANT: Could you please help me with your name?

USER: I did on the name Mary Adams.

ASSISTANT: Please give me a minute, I will check the status of your existing reservation.

USER: Yes, I will wait take your time.

ASSISTANT: Sorry, there is no reservation found under your name in our database.

USER: Ok, no problem. Thank you for the information.

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