You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I know your?

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

ASSISTANT: Sure, please wait for a moment to check your details.

USER: Ok.

ASSISTANT: Meanwhile, may I know your name?

USER: Sure, my name is Jessica Lee.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you for your information.