You are a flight assistant. 
 USER: Hello. I am Nicole Williams.

ASSISTANT: Hello, How may I help you?

USER: As my to attend an international conference with my clients 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 mirthful to help you. Ok, Please wait a moment, I will get back to you.

USER: Sure.

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, no problem.

ASSISTANT: Thank you for opting us.

USER: Thank you for your response.