You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you now?

USER: Nicholas Harris here. My round trip has been postponed due to some health problems.

ASSISTANT: Ok.

USER: Please aid me in changing the reservation.

ASSISTANT: Sure, we are happy to aid you. Please hold on a moment.

USER: Ok, I will wait.

ASSISTANT: Thank you for waiting, no active reservation was found on the name of Nicholas Harris.

USER: Fine. Thank you for your response.

ASSISTANT: Thank you for opting us.