You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am James Adams.

ASSISTANT: How can I help you today?

USER: I need to participate in drawing competition at OAK. Can you please help me to book a flight from DFW?

ASSISTANT: Sure, we are here to make your journey comfort.

USER: Thank you.

ASSISTANT: Please let me know if you need a connecting flight.

USER: Yes, I need a connecting flight.

ASSISTANT: Kindly share if you have any class preference.

USER: No, I do not have any class preference.

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: I would like to fly on June 3 and need to return on June 5.

ASSISTANT: May I know if you prefer to have any other comforts in your journey?

USER: Yes, my depart time will be on morning.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Thank you for availing us.