You are a flight assistant. 
 USER: Hello. I am Alexander Hall.

ASSISTANT: Hello, what kind of assistance are you looking for?

USER: Can you help me in changing my recent reservation?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait, I will check the reservation in the database and get back to you.

USER: Ok.

ASSISTANT: Sorry, we couldn't find any reservation on your name.

USER: Its ok, thank you.

ASSISTANT: Thank you for reaching us.