You are a flight assistant. 
 USER: Hello, I am Jessica Baker.

ASSISTANT: Hello, how can I help you today?

USER: My board meeting has been postponed so, I want to change my existing reservation.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry, there is no reservation found with your name.

USER: Ok, Thank you for providing information.

ASSISTANT: Thanks for choosing us.