You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Robert Gonzalez.

ASSISTANT: How can I assist you?

USER: I would like to travel from OAK to ATL, can you help me to book  a flight ticket?

ASSISTANT: Sure, we are happy to help you. Can you please let me know your trip dates?

USER: My preferable journey dates are Dec 22 and Dec 24.

ASSISTANT: Do you have any stopover in between journey?

USER: I am comfortable with any connection.

ASSISTANT: Are you comfortable with economy class?

USER: I am comfortable with any class.

ASSISTANT: Kindly mention your depart and arrival timings.

USER: I would like to depart in the afternoon.

ASSISTANT: Thanks for providing details, no flights are available on your journey route.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.