You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Michael Lee.

ASSISTANT: I am here to book a flight ticket for you.

USER: I need to alter my reservation, can you help me out please?

ASSISTANT: Ok, I will help. Please wait.

USER: Ok.

ASSISTANT: Sorry, there is no reservation been done on your name.

USER: That's ok, no problem. Thank you for your help.

ASSISTANT: Ok, thank you for connecting with our agency.