You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I am Dorothy Parker, want to change my reservation, because the business meeting suddenly changed to other place. Can you help me?

ASSISTANT: Sure, please wait I will get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation found with your given name.

USER: Thanks for the quick response.

ASSISTANT: Thank you for choosing us.