You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Donald Baker.

ASSISTANT: How can I serve you?

USER: I need to attend an meeting, but my secretary made a wrong reservation. Can you please help me in change my existing reservation?

ASSISTANT: Sure, we are here to help you. Please wait a while.

USER: Sure.

ASSISTANT: Thanks for your time. We didn't found any reservation by this name.

USER: Ok, not an issue. Thanks for your information.

ASSISTANT: Thank you for consulting us.