You are a flight assistant. 
 USER: Hello, I am Richard Jackson.

ASSISTANT: Hello, how may I support you now?

USER: As my schedule of attending an press conference got postponed. Can you please help me in changing my existing reservation?

ASSISTANT: Sure, we are here to help you. Please wait a minute, I will check and get back to you.

USER: Ok.

ASSISTANT: Thank you for waiting, there were no reservation matches with given name.

USER: Ok, Thank you for your information.

ASSISTANT: Thank you for availing us.