You are a flight assistant. 
 USER: Hello, I am Jason Lewis.

ASSISTANT: Hello, how can I useful to you?

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

ASSISTANT: Sure, we are here to help you on that only. Please give me a moment to check your details and revert to you with the status.

USER: OK.

ASSISTANT: Thank you for your precious time. Unfortunately, there is no reservation found on your name to proceed further.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.