You are a flight assistant. 
 USER: Hi.

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

USER: I am Ashley Parker. Can you please change my existing reservation as  my plan to go for holiday trip got postponed?

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

USER: Sure.

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.