You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you please change my existing reservation as my plan to go for holiday trip got postponed?

ASSISTANT: Ok, may I know your name please?

USER: I am Betty Hill.

ASSISTANT: Ok, please wait a minute. I will get back to you soon.

USER: Sure.

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

USER: It's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for approaching us.