You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Gary Carter here.

ASSISTANT: How can I aid you at this moment?

USER: Actually, I am looking for a direct flight for my journey, can you please help me out with booking of a flight ticket between Atlanta and San Francisco?

ASSISTANT: Sure, I am happy to aid you in booking flight ticket. Could you please mention your preferable travel dates for booking flight ticket?

USER: Thank you for taking my request into consideration, I am planning to departure on 08/28 and please book my return ticket also on 08/30.

ASSISTANT: May I know your airport code names for further process?

USER: I will prefer ATL and SFO as my origin and destination airport codes respectively.

ASSISTANT: Thank you for providing your travel details. I will put the conversation on hold to check the best flights available in your route.

USER: It's alright, take your time.

ASSISTANT: Sorry for the inconvenience no direct flights are available in this route as per your requested dates.

USER: Oh! Sad to hear that. Anyway, I will find another alternative to complete my journey. Thank you for the information.

ASSISTANT: Thank you for reaching us, have a good day.

USER: Welcome.