You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Shirley Collins is here.

ASSISTANT: How can I render you today?

USER: Book a ticket for both start and return flight on 11/13 and on 11/15.

ASSISTANT: Sure, please kindly mention your source and destination codes?

USER: Ok, my source and destination codes are EWR and AT.

ASSISTANT: Do you need any stop over in between your journey?

USER: Yes, I need one stop over.

ASSISTANT: Can you please mention your destination code?

USER: ATL is my airport code.

ASSISTANT: Thanks for your details, there is no flight found on your journey dates.

USER: OK. No problem.

ASSISTANT: Thank for picking us.