You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: As my visit to Getty center at Los Angels  has been postponed. Help me in changing my resent reservation.

ASSISTANT: Sure, can I have your name please?

USER: I am Gary Evans.

ASSISTANT: Ok, please wait for a moment I will get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting, we have not found any flight reservation with your given name.

USER: No problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your support.