You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Shirley Brown, can you help me for changing my existing reservation, because in my previous reservation I gave wrong airport codes?

ASSISTANT: Sure, I will help you out. Please allow me a moment to check the reservation details.

USER: Ok, I will wait for your but get back with my reservation status.

ASSISTANT: Sorry Brown, there is no reservation on your name in our database.

USER: Oh! It's ok, no problem. Thank you for your services.

ASSISTANT: Thank you for reaching us.