You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I was trying to change my flight reservation by myself but as your policy does not allow us. So can you help me in change of flight ticket reservation?

ASSISTANT: Sure, please provide your name.

USER: I am Ronald Robinson.

ASSISTANT: Wait a minute.

USER: Sure.

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

USER: That is not a problem. Thanks for your help.

ASSISTANT: Thank you for choosing us.