You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How can I help you today?

USER: Owing to an emergency, my trip to New York for Sky diving has been postponed. So I had a request to you to change my existing reservation?

ASSISTANT: Sure, we are here to help you. Can I have your name for proceeding further?

USER: Sure, I had a recent reservation with name Jack Martin.

ASSISTANT: Ok, please wait for a while I will check with the reservation and get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting, sorry Jack we did not find any reservation basis on your given name.

USER: Ok, no worries at all. Thank you. I appreciate your quality customer service.

ASSISTANT: Thank you for approaching us. Thank you visit us again.