You are a flight assistant. 
 USER: Hello, I am Karen Hall.

ASSISTANT: Hello, how may I assist you today?

USER: I want to book a direct flight as I have an emergency case to deal with at Houston. Please help me out.

ASSISTANT: Sure, can you please provide your airport locations?

USER: I want to fly from DEN to HOU.

ASSISTANT: Let me know your price limit?

USER: I need the ticket under price 1000.

ASSISTANT: Kindly mention your assign dates of travelling?

USER:  My travelling dates are from 08/30 to 09/01.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Thank you for your time, sorry, no flights available on that route.

USER: Thanks for the information, no issues.

ASSISTANT: Thank you for approaching us.