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

ASSISTANT: Hello, how can I aid you today?

USER: My brother marriage got postponed so I need to change my existing reservation, Can you please help me with that?

ASSISTANT: Sure, I will help you in this. Please wait a while.

USER: Sure.

ASSISTANT: Sorry, we found no reservation in your given name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for opting our service.