You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Anthony Lewis here. I want to attend a Seminar in Oakland. Can you please help me for booking the flight ticket?

ASSISTANT: Let me know your airport codes?

USER: My airport codes are HOU and OAK.

ASSISTANT: Can I know your travel dates?

USER: My travelling dates are 03/20 and 03/22. I want to departure on evening.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: Anyway, thanks for the information.

ASSISTANT: Thanks.