You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Lisa Thompson here.

ASSISTANT: Yes, Lisa.

USER: Can you please book a flight ticket from IAD to ORD?

ASSISTANT: Sure, may I know your travel dates?

USER: Sure, I need to travel on dates of 11/21 and 11/23.

ASSISTANT: UA airlines is having a flight with travel charge of 100, shall I proceed booking?

USER: It is fine, please proceed with booking.

ASSISTANT: Your ticket has been booked with flight-1013, have a safe flight.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.

USER: Most welcome.