You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you help me to book a flight ticket from IAD to LAS?

ASSISTANT: Sure, can you share your trip dates?

USER: My travelling dates are 18 to 20 of Nov.

ASSISTANT: Do you have any specifications?

USER:  I am willing to travel in a single connecting flight.

ASSISTANT: May I know your name?

USER: I am Alexander Perez.

ASSISTANT: There is a connecting flight with number 1025 in airline AA, the fare is 100 in economy class. Can I book it?

USER: Please proceed.

ASSISTANT: Your ticket is reserved.

USER: Thanks for helping me.

ASSISTANT: Thank you for opting us.