You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your travel dates please?

USER: Apr, 30 and May, 2 are my travel dates.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Sure.

ASSISTANT: I found a flight for you with American Airlines and it costs you 100. Shall I proceed to reserve a seat in this single connecting flight?

USER: Please proceed.

ASSISTANT: Your ticket has been booked with 1000 flight number.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Sandra Hernandez.

ASSISTANT: Thank you for choosing us.

USER: Welcome.