You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how shall I help you today?

USER: I am Ashley Taylor.

ASSISTANT: OK.

USER: I want to celebrate Christmas festival at Dallas, DFW. Can you help me in booking on 12/25?

ASSISTANT: Sure, I can help you out. May I know your return date?

USER: I will be return on 12/27.

ASSISTANT: Ok, your origin point please?

USER: My origin is Houston, IAH.

ASSISTANT: Sorry, no flights are available. Thanks for consulting us.