You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Jason Young, please help me in booking flight ticket from CLT to SFO.

ASSISTANT: May I know your travel dates?

USER: Sure, my travelling dates should be 04/14 and 04/16.

ASSISTANT: Sorry, there is no flight found basis on your details.

USER: It's ok, I will concern another agency to full fill my trip. Thanks for your information.

ASSISTANT: Thank you for reaching us.