You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I have reserved a ticket previously to New York, but unfortunately I have a business meeting in my hometown, so I want to change my reservation, can you help me?

ASSISTANT: Sure, I am here to help you. For checking your reservation, may I know your name?

USER: I reserved the ticket on the name Christopher White.

ASSISTANT: Ok, please be online for sometime. I will check your reservation status and get back to you.

USER: Sure, take your time.

ASSISTANT: White, I did not find any reservation by your name in our database.

USER: That's fine, I will check for other alternative. Anyway, thank you for your information.

ASSISTANT: You are welcome and thank you for contacting us.