You are a flight assistant. 
 USER: Hello. I am Laura Thomas.

ASSISTANT: Hello, how can I provide service to you?

USER: I want to change my existing reservation due to sudden rainfall at my source. Can you please help me with this?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait for a minute.

USER: Sure.

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

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Thank you for reaching us.