You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Can you help me to book a ticket from LAS to OAK?

ASSISTANT: Sure, can I know the travel dates please?

USER: My trip dates are Jul 21 and Jul 23 respectively.

ASSISTANT: May I know your name please?

USER: John Davis here.

ASSISTANT: Do you have any requirements?

USER: Make sure that connecting limit is 0.

ASSISTANT: Sorry, there are no flights available as per your request.

USER: Not an issue.

ASSISTANT: Thank you for approaching us.

USER: Thank you.