You are a flight assistant. 
 USER: Hello, I am Larry Phillips.

ASSISTANT: Hello, how may I support you at present?

USER: Can you please book a ticket from ATL to SFO to attend Film festival?

ASSISTANT: Sure, let me know your preferred journey dates.

USER: My journey dates are Oct 7 and Oct 9.

ASSISTANT: Please help me with your class preference.

USER: I am comfortable with any class.

ASSISTANT: May I know your depart and arrival timings?

USER: My return time is evening.

ASSISTANT: Ok, Do you need any stopover in between your journey?

USER: I want single connection.

ASSISTANT: Ok, please standby.

USER: Ok.

ASSISTANT: We regret to inform you that, there are no flights moving to your region with your planned dates of travelling.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for approaching us.