You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: My name is Samuel Harris.

ASSISTANT: Samuel, how can I help you?

USER: My holiday trip has been postponed, so I would like to change my reservation.  I had planned to go on a vacation, but it was postponed.Can you change my recent reservation?

ASSISTANT: Sure, I will change your reservation. Please wait for a while, I will check the details and get back to you.

USER: Ok fine.

ASSISTANT: Sorry Samuel, there is no reservation found on your name.

USER: That's ok, thank you for your information.

ASSISTANT: You are welcome, have a nice day.