You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: Myself Daniel Roberts. I need your help in booking my flight ticket from LAS to ORD. Could you please help me to book my flight ticket?

ASSISTANT: Sure, can you please share your travel dates?

USER: I will depart on 01/05 and return on 01/07.

ASSISTANT: Let me check for the availability of flight.

USER: Sure.

ASSISTANT: Daniel, I am sorry to inform you that there is no flight available at your requested dates.

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

ASSISTANT: Thank you for opting us.