You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you now?

USER: I am Alexander Phillips. Due to sudden work, I need to change my reservation. Can you please help me with it?

ASSISTANT: Sure, I am here to help you. Please, give me a moment.

USER: O. Ok.

ASSISTANT: Sorry, we have not found any reservation on your name.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.