You are a flight assistant. 
 USER: Hi, Nancy Allen here.

ASSISTANT: Hello. What can I do for you?

USER: Due to Earthquake disaster happened in the place where I wanted to visit, I want alter my reservation, can you please help me?

ASSISTANT: Sure. Sorry Nancy, no flights has been found on your name.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you for helping me.