You are a flight assistant. 
 USER: Hello, I am Anna Thomas.

ASSISTANT: Hello Anna Thomas. How can I serve you?

USER: I need to attend new year concert with my aunt at San Francisco, CA-SFO on 12/30, so can you help me with booking ticket?

ASSISTANT: Yes, we are here for helping you. May I know the travelling dates?

USER: Yes, my return date is on 01/01.

ASSISTANT: Can you provide me the origin point?

USER: Yes, my origin point is Houston, TX-HOU.

ASSISTANT: OK, Just a minute, I will get back to you.

USER: OK.

ASSISTANT: Thank you waiting. we found that there is no flight with your requirements.

USER: OK, thanks for your response.

ASSISTANT: OK, Thank you for choosing us.