You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I assist you?

USER: As my to attend an international conference has been postponed, and again it has to start in the next week. Can you please help me to change an existing reservation?

ASSISTANT:  Sure, I am blissful to help you.

USER: I am Eric Robinson.

ASSISTANT: Wait a moment.

USER: Ok.

ASSISTANT: Thank you for waiting. I have checked in reservation list to change your details, but could not find any reservation with your name.

USER: Ok, not a problem.

ASSISTANT: Thank you for opting us, Have a great day.

USER: Thanks for your quick response.