You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Scott Evans. Can you please help me in booking my flight ticket from SFO to HOU?

ASSISTANT: May I know your desired travel dates please?

USER: My travelling dates are 04/25 and 04/27.

ASSISTANT: Please wait a while, I will check and inform you.

USER: Ok, sure.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for reaching us.