You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you at this moment?

USER: Can you please help me to search a flight from Houston TX-HOU?

ASSISTANT: Sure, what are your departure and arrival dates of your travel?

USER: The departure date is 11/03 and the return date is 11/05.

ASSISTANT: Yes, could you provide me your name for further process?

USER: Sure, my name is Dennis Lewis.

ASSISTANT: Ok Lewis, can I have your destination code please?

USER: The destination code is CA-SFO.

ASSISTANT: Ok, wait for a minute.

USER: Sure.

ASSISTANT: Sorry Lewis, no flight's found on your travelling dates.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.