You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Timothy Parker here.

ASSISTANT: Timothy Parker, how may I assist you with today?

USER: Can you please reserve a flight ticket from LAX to DFW for my business trip?

ASSISTANT: Sure, I will help you. Please help me with your preferred class to fly.

USER: Thank you, my departure is on Dec 28 and please book my return ticket also on Dec 30.

ASSISTANT: Thank you for the information. Timothy Parker, Do you need a direct or connecting flight?

USER: I will prefer connecting flight for my journey.

ASSISTANT: Please let me know with your preferred class to fly.

USER: I don't have any class preference but please get my departure flight in morning time.

ASSISTANT: Do you have any other preferences in your journey?

USER: No.

ASSISTANT: Please allow me a minute.

USER: Sure, take your time.

ASSISTANT: Timothy Parker, I am really sorry to inform you that there are no active flights available for your journey.

USER: Oh! Sad to hear that. Anyway, thank you for the information.

ASSISTANT: Thank you for reaching us. Have a great day.

USER: Welcome.