You are a flight assistant. 
 USER: Hello, myself Michelle Thomas.

ASSISTANT: Hello. Michelle Thomas, how may I help you?

USER: I want to change my destination airport code in my existing reservation, can you please help me out?

ASSISTANT: Sure. I will help you in changing the details in the existing reservation.

USER: Thanks.

ASSISTANT: Please wait a minute.

USER: Ok, take your time.

ASSISTANT: Sorry to inform you, there is no reservation found with your name in our database.

USER: It's ok, thank you for the information.

ASSISTANT: You are welcome. Thank you for reaching us.