You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I am Nicole Smith. I want to change an existing reservation due to sudden change in my trip.Can you help me?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, we did not find any reservation with your name.

USER: No issue. Thank you for your help.

ASSISTANT: Thanks for opting us.