You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I  help you?

USER: I made a plan to meet my friends but now due to my work I have to post pone, can you please help me to change the dates of my reservation?

ASSISTANT: Sure, may I know your name please?

USER: My name is Brandon Lee.

ASSISTANT: I am sorry no reservation found on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.