You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: May I know your travelling dates?

USER: Travelling dates are Jan, 25 and Jan, 27.

ASSISTANT: Can I know your connection limit?

USER: I would be comfortable with single stop over.

ASSISTANT: May I know your name?

USER: My name is Robert Collins.

ASSISTANT: Do you have any other preference?

USER: I prefer to fly in a normal-cost airlines.

ASSISTANT: Sorry, no flights available on your route.

USER: Thank you.

ASSISTANT: Thank you for reaching us.