You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I want to change my reservation as my plan match got postponed due to heavy snow fall in Houston. Can you please help me in changing?

ASSISTANT: Sure, may I know your name?

USER: I am Ronald Perez.

ASSISTANT: Give me a minute for checking.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: Ok fine, thanks for checking.

ASSISTANT: Thank you for opting us.