You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I need to change my reservation as my reporting date has been postponed. Can you help me with it?

ASSISTANT: Sure, may I know your name?

USER: My name is Donna Hernandez.

ASSISTANT: Ok, please wait I will  revert you.

USER: Sure.

ASSISTANT:  Sorry, no reservation found on your name.

USER: Ok, thank you for your response.

ASSISTANT: Thank you for availing us. Have a great day.