You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Frank Young. Can you please help me in booking my flight ticket from HOU to LGA?

ASSISTANT: Ok, can I have your trip dates too?

USER: My trip dates are 03/07 and 03/09.

ASSISTANT: Please hold on a moment.

USER: Ok, sure.

ASSISTANT: Sorry, there is no flight for you on your preferable dates. Thanks for approaching us.

USER: Ok, fine thank you for checking.