You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you at this moment?

USER: I want to fly from OAK to DFW. Can you book a ticket from that root?

ASSISTANT: Ok, may I know your travelling dates?

USER: My planned travel dates are 09/10 and 09/12.

ASSISTANT: Ok, do you have any other requirements?

USER: I want 1 halt with economy class. My return time should be in afternoon only.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates. May I know your name?

USER: Sure, Eric Scott here.

ASSISTANT: Thank you for reaching us.

USER: No issues, thank you for the information.