You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Alexander Lopez.

ASSISTANT: How can I assist you?

USER: Due to some client meeting, I am going to change my reservation. Can you please help me for this?

ASSISTANT: I am here to help you.

USER: Ok, I will wait for your kind response.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name to change.

USER: Not an issue, anyhow thank you very much for your service.

ASSISTANT: Thank you for connecting with us.