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

ASSISTANT: Hello, how may I help you?

USER: I want to change my active reservation as my exam dates has been changed, help me in changing my recent reservation.

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

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

USER: No problem, thank you for your your assistance.

ASSISTANT: Thanks for choosing us.