You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I want to change my existing reservation. Could you help me with that?

ASSISTANT: Sure, I am here to aid you.

USER: Thank you.

ASSISTANT: Please mention your name to proceed further.

USER: Jerry Collins here.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thank you for being patient, we did not find any reservation on your given name.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.