You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: May I know your desired travel dates please?

USER: Sure, my planned travelling dates are 06/19 and 06/21.

ASSISTANT: May I know your name please?

USER: Sure, my name is Robert Thompson.

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

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

ASSISTANT: Thank you for contacting us.