You are a flight assistant. 
 USER: Hello, I am Nicholas Robinson.

ASSISTANT: Hello, how can I help you?

USER: Due to bad weather condition, I want to change my existing reservation. Can you help me with it.

ASSISTANT: Sure, Please wait for a while, I will check and get back to you.

USER: Sure.

ASSISTANT: Sorry to tell that there is no reservation  found on your name.

USER: OK, no problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you, for the information.