You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you for the day?

USER: I am Deborah Collins. I ant to change my reservation, can you help me in this?

ASSISTANT: Sure, I am here to help you.

USER: Thanks.

ASSISTANT: Please wait for a moment.

USER: OK.

ASSISTANT: Sorry, we found no reservation on your given name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.