You are a flight assistant. 
 USER: Hello, myself Elizabeth Miller.

ASSISTANT: Hello,. How can I help you?

USER: I am planning to book a flight ticket to SFO from HOU, can you please help me out?

ASSISTANT: Let me know your travelling dates.

USER: Sure, my planned travelling dates are July 10 and 12.

ASSISTANT: Do you have any preference?

USER: Please make sure my depart time must be in evening.

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

USER: It's ok, thank you for the information.

ASSISTANT: Thank you.