You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Kimberly Martin. I want to change my existing reservation due to sudden change in my plan. Can you help me out?

ASSISTANT: Sure. I will help you. Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation showing on your name.

USER: Ok, No problem. Thank you.

ASSISTANT: Welcome, thank you for reaching us.