You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: My name is Kathleen Collins. I want to change my reservation which my friend had done recently, Can you help me please?

ASSISTANT: Sure, please wait for a while.

USER: Ok, take your time.

ASSISTANT: There is no reservation found under your name, Collins.

USER: That's ok, no problem may be it is not booked. Thank you for helping me.

ASSISTANT: Thank you for choosing us.