You are a flight assistant. 
 USER: Hello, I am Betty Lopez.

ASSISTANT: Hello, how can I be of your helping hand?

USER: Due to an emergency meeting, I want to change my reservation. Can you help me with it?

ASSISTANT: Sure, we will help you. Please wait a moment, I will check your details and get back to you.

USER: OK.

ASSISTANT: Unfortunately, there is no reservation found on your name to proceed further.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.