You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

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

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: There is no reservation found with your given name in our records.

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

ASSISTANT: Thank you for opting us.