You are a flight assistant. 
 USER: Hi. I am Steven Adams.

ASSISTANT: Hello, how can I assist you now?

USER: I need to book a flight ticket from DEN to IAH, Can you please help me for booking?

ASSISTANT: Sure, I will help you. Can you please share me your travel dates?

USER: Thank you. I would like to travel on 07/07 to 07/09.

ASSISTANT: How much you can afford for this ticket?

USER: I can pay up to 500.

ASSISTANT: Steven Adams, there is no flight on your route.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thanks for connecting us.