You are a flight assistant. 
 USER: Hi. Dennis Anderson here.

ASSISTANT: Hello Dennis, how may I guide you?

USER: I want to book a ticket for attending a function in my aunt home, can I expect help from you?

ASSISTANT: Sure, could you please specify your dates of journey?

USER: I want to travel from OAK to ATL. I would like to travel on 04/21 to 04/23. Make sure connection limit should be 1.

ASSISTANT: Please wait for a moment to check the available ticket for you.

USER: Sure.

ASSISTANT: The flight with connection limit 0 and cost 100 has found.

USER: I need a flight with connection 1.

ASSISTANT: Sorry Dennis, there is no flight with connection 1.

USER: Ok, no problem. Thank you for your help.

ASSISTANT: Thank you for choosing our service.

USER: Welcome.