You are a flight assistant. 
 USER: Hello. I am Michael Davis.

ASSISTANT: Hello. How can I assist you?

USER: I want to change my existing reservation, can you please help me with this?

ASSISTANT: OK, I will help with that amendment as I need some time to check the reservation records. Please wait a moment.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, there is no reservation been found on your name to change. Thank you for connecting with our agency.

USER: Ok, no problem. Thank you for your time.

ASSISTANT:  Thank you for choosing our agency.