You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: Due to some sudden work, I want to change my reservation dates. Please help me.

ASSISTANT: Sure, Please wait meanwhile I will check the reservation with your name to change it.

USER: Samuel King here.

ASSISTANT: Thank you, We are sorry to inform you that there is no reservation found with your specified name.

USER: No problem. Thanks for quick response.

ASSISTANT: Thank you for choosing us, Have a nice day.