You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Jeffrey Young. I am planning to change an existing reservation, due to some urgent work. Can you please change my reservation?

ASSISTANT: Sure, please give me a minute. I will check the reservation status.

USER: Sure take your own time.

ASSISTANT: Sorry Young, there is no reservation available on your name.

USER: That' s fine. Thank you for your service.

ASSISTANT: You are welcome.