You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Betty Robinson.

ASSISTANT: How can I serve you?

USER: I want to change my reservation which I have done earlier. Can you serve me in that?

ASSISTANT: Sure, Please wait a while.

USER: OK.

ASSISTANT: Thank you for time.

USER: OK.

ASSISTANT: We didn't found any reservation by this name.

USER: Ok, not a problem. Thanks for the response.

ASSISTANT: Thank you for consulting us.