You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: My holiday trip was postponed due to heavy work in office, can you change my reservation?

ASSISTANT: Sure, let me know your name please.

USER: My name is Kathleen White.

ASSISTANT: Just be on hold, I will revert you.

USER: Ok.

ASSISTANT: Sorry, there is no reservation under your name.

USER: No issue. Thank you for checking.

ASSISTANT: Thank you for contacting us.