You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Angela Parker. I want to book a flight ticket from DEN to IAH. Could you help me in booking?

ASSISTANT: Sure, please share me trip dates.

USER: My travelling dates are from June 30 to July 02.

ASSISTANT: Do you need any specifications? Please hold for a moment.

USER: I prefer for normal cost airline. Ok.

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

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.