You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you aid me to book a ticket from ORD to HOU?

ASSISTANT: May I know your trip dates?

USER: My travel dates are Dec 11 and Dec 13 respectively.

ASSISTANT: Do you prefer any connections?

USER: Make sure that connection limit is single.

ASSISTANT: Do you prefer any specifications?

USER: My depart time should be in the afternoon and arrival time should in the morning.

ASSISTANT: Can you please share your name?

USER: Anthony Smith here.

ASSISTANT: Sorry to inform you that unfortunately there is no flights available by the given details.

USER: No issue. Thank you.

ASSISTANT: Thank you.