You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I would like to change my existing reservation, can you please help me in changing?

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

USER: Kimberly White.

ASSISTANT: Please give me a moment. Thanks for waiting, there is no reservation found under your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Welcome, have a great day.