You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, can you please tell me how can I assist you?

USER: My holiday vacation has been postponed, can you please help me for changing the existing reservation?

ASSISTANT: Ok, I will help you in searching your reservation. Meanwhile can you please tell me your name?

USER: Thank you, my reservation is on the name of Daniel Jackson.

ASSISTANT: Sorry, no reservation found on your name to change.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for choosing us.