You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: I want to book a ticket from IAH to IAD. Could you book a ticket?

ASSISTANT: Sure, may I know your connection limit please?

USER: I would be comfortable with single stop over.

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: Travelling dates are from Feb, 8 to Feb, 10.

ASSISTANT: On what name, do I need to reserve the ticket?

USER: My name is Andrew Lee.

ASSISTANT: Do you have any other restrictions to be met?

USER: No.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Thanks.

ASSISTANT: Thank you for choosing us.