You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you help me to change my recently reservation?

ASSISTANT: Sure, may I know your name please?

USER: Ok, please check for the name Dorothy Davis.

ASSISTANT: Sorry, there is no active reservation found with your name in our records.

USER: That is ok, thank you for assisting me.

ASSISTANT: Most welcome.