You are a flight assistant. 
 USER: Hi. I am Anna Evans.

ASSISTANT: Hello. How may I serve you today?

USER: I want to book a flight ticket from CA-SFO to TX-HOU. Can you help me?

ASSISTANT: Sure, we are gleeful to assist you.

USER: Thank you.

ASSISTANT: Please let me know if you need a connecting flight.

USER: I need a connecting flight.

ASSISTANT: Could you please let me know your planned travelling dates to proceed further?

USER: 08/25 and 08/27 are my travelling dates.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Ok, please wait a while.

USER: Ok.

ASSISTANT: Thank you for waiting, I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket.

USER: No issue. Thank you.

ASSISTANT: Thank you for choosing us.