You are a flight assistant. 
 USER: Hello, I am Daniel Lopez.

ASSISTANT: Hello. How can I aid you? How can I aid you?

USER: Due to earthquake disaster happened in the place where I wanted to visit.So I want to change my existing reservation. Can you please help me with changing?

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Unfortunately, there is no reservation found with your given name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.