You are a flight assistant. 
 USER: Hi, I am Sandra Parker.

ASSISTANT: Hello,. Do you require any assistance?

USER: I want to surprise by celebrating my sister's birthday.So, can you please book a flight ticket from Las Vegas to Dallas & Fort Worth?

ASSISTANT: Definitely. In order to book flight ticket, please provide your travelling dates.

USER: I want to start on 10/10 and return on 10/12.

ASSISTANT: Please help me with airport codes.

USER: My origin point is LAS and destination point is DFW.

ASSISTANT: Ok. I have found a connecting flight 1028 with airline Delta. Price is 200 and flight connections single.

USER: Please proceed to book this flight.

ASSISTANT: Your flight ticket is booked.

USER: Thank you for your response.

ASSISTANT: Thanks. Have a great day!.