You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Ashley Miller.

ASSISTANT: How can I aid you?

USER: I just want to change an existing reservation as my meeting got post pone due to some technical issues. Can you help me with it please?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation status.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry to say, there is no active reservation have been found under your name in our database to amend it.

USER:      That's ok, thank you for the response.

ASSISTANT: Thank you for reaching us.