You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How could I aid you today?

USER: I need to book a flight ticket from JFK to IAH, Can you please help me for booking?

ASSISTANT: Sure, can I know your travelling dates?

USER: I would like to travel on 07/16 to return on 07/18.

ASSISTANT: Is there any other requirements, please let me know?

USER: I need a return time in the evening.

ASSISTANT: Please provide your name.

USER: Matthew Robinson here.

ASSISTANT: Unfortunately there is no flight found with your given dates.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for opting us.