You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, Good morning.How may I aid 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, let me check is there any existing reservation or not, for that may I know your name please?

USER: Ok, My name is Benjamin Lopez.

ASSISTANT: Benjamin, there is no reservation on your name.

USER: That's ok. Thank you for your information.

ASSISTANT: Thanks for reaching us. Have a nice day.