You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Susan Adams. Can you help me for changing my existing reservation, because in my previous reservation I gave wrong airport codes?

ASSISTANT: Yes, I can help you.

USER: Thank you.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: Oh! It's ok, I think reservation done not properly.

ASSISTANT: Thank you for contacting us.