You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you at this moment?

USER: My name is Daniel Smith, I want to change my reservation as my plan to visit my home is postponed. Can you change my reservation?

ASSISTANT: Sure, please wait for few minutes.

USER: Sure.

ASSISTANT: There is no existing reservation found on your name in our records.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.