You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to reschedule my recent reservation as my joining date got postponed. Can you please change my reservation made on name Linda Hill.

ASSISTANT: Sure, give me some time.

USER: Ok.

ASSISTANT: Thanks for waiting, unfortunately there is no reservation found by this name.

USER: Ok, no problem. Thanks for your response.

ASSISTANT: Thanks for approaching us, have a great day.