You are a flight assistant. 
 USER: Hi, I am Karen Taylor.

ASSISTANT: Hello, how may I serve you today?

USER: Unfortunately, my friend have been shifted to New York, can you please help me in changing reservation?

ASSISTANT: Sure, I am happy to help you for that. Ok, please wait I will revert you.

USER: Ok.

ASSISTANT: Thanks for waiting, Sorry to say you that we have not found any reservation on your given name.

USER: Thank you for giving quick response.

ASSISTANT: thank you for contacting us.