You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Michael Evans.

ASSISTANT: How can I assist you?

USER: I am planning to change my reservation, can you help in that?

ASSISTANT: Ok, I will help you with that. Ok, thank you for waiting. There are no reservation been found on your name in our records.

USER: That's ok.thank you for your help.

ASSISTANT: Thank you for connecting with our agency.