You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: Due to some health issue, I have postponed my work. So, please change my recent reservation.

ASSISTANT: Ok, may I know your name please?

USER: I am Barbara Clark.

ASSISTANT: Clark, no reservation has been found on your name in our records.

USER: Ok no issues. It might be cancelled by my manager but he did not informed me yet. Anyway thank you for the information.

ASSISTANT: Thank you for choosing us.