You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Jason Jackson.

ASSISTANT: How can I aid you?

USER: I want to book a flight ticket to DFW to attend my uncle's house warming ceremony, can you please book me a ticket on 02/25?

ASSISTANT: SUre, Can I know your airport codes?

USER: I will start from LGA.

ASSISTANT: When would you like to return?

USER: I will return on 02/27.

ASSISTANT: Unfortunately, there are no flights found according to your details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.