You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I provide assistance to you?

USER: Can you help me to book a flight ticket from SFO to ATL?

ASSISTANT: Sure, can I have your travel dates?

USER: My travel dates are May 19 and May 21.

ASSISTANT: May I know your connection limit?

USER: I prefer connecting flight for this trip.

ASSISTANT: Do you have any other preferences?

USER: No, I don't have.

ASSISTANT: Please share your name to proceed for further.

USER: My name is Gary Thomas.

ASSISTANT: Sorry, there is no flight on your required route.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.