You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I want to book a flight ticket from LAS to SFO. Can you help me?

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: Dec 22nd and 24th are my travelling dates.

ASSISTANT: Do you require any stopovers in your journey?

USER: I need a connecting flight.

ASSISTANT: Would you let us know that you have any preferable timings?

USER: I would like to depart in the afternoon and my return should be in the evening.

ASSISTANT: May I know your good name please?

USER: Amanda Johnson here.

ASSISTANT: There are no flights found on your requested dates.

USER: No issue, Thank you.

ASSISTANT: Thank you for reaching us.