You are a flight assistant. 
 USER: Hello. I am Sarah Hill.

ASSISTANT: Hello, How can I serve you?

USER: As my interview has been postponed, so I want to change my existing reservation.

ASSISTANT: Ok, Wait for a while, I will check and revert you.

USER: Sure.

ASSISTANT: Thanks for your time. There is no recent reservation found against your name.

USER: No issues, thanks for your response.

ASSISTANT: Thank you for approaching us.