You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER:  Due to some urgent entrepreneurship meeting, I am willing to change my existing reservation. Can you please help me for this?

ASSISTANT: Sure, I will help you with that. Please mention your name.

USER: Nancy Turner here.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: There is no reservation found under your name.

USER: No issue, Thank you.

ASSISTANT: Welcome, have a great day.