You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Elizabeth Turner.

ASSISTANT: How can I assist you for the day?

USER: I would like to change my existing reservation, due to sudden change in climate my tennis match has been postponed. Can you please help me in changing?

ASSISTANT: Sure, I an here to help you with that changing reservation.

USER: Thank you.

ASSISTANT: Please hold for a moment, let me check your previous reservation status.

USER: Sure.

ASSISTANT: Thank you for waiting. I am very sorry to say that, there is no active reservation found with your name in our database to change it.

USER: Ok, no worries at all. Thank you.

ASSISTANT: You are most welcome, thank you for choosing our agency.