You are a flight assistant. 
 USER: Hello, I am Jonathan Martinez.

ASSISTANT: Hello, How can I help you?

USER: Can you help me in changing my reservation as my brother's marriage got postponed?

ASSISTANT: Sure, Wait a minute I will check and get back to you.

USER: Ok.

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

USER: It's OK thanks for the information.

ASSISTANT: Thank you for approaching  us.