You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I need to meet a doctor at Vegas, NV-LAS. can you please help me out for booking a flight ticket?

ASSISTANT: Sure, I will book a ticket, may I know your travelling dates?

USER: My travelling dates are from 04/10 to 04/12.

ASSISTANT: Please mention your source code.

USER: My leaving point is from Chicago, IL-ORD.

ASSISTANT: May I know your name for booking a ticket?

USER: I am Margaret Smith.

ASSISTANT: There is a UA 1003 airline with fare of 100 which matches your travelling dates. Shall I proceed with booking?

USER: Yes, you can proceed with the booking.

ASSISTANT: Your booking has been confirmed on name of Margaret Smith.

USER: Thank you for the help.

ASSISTANT: Thank you for approaching us.