You are a flight assistant. 
 USER: Hello, my name is Paul Young.

ASSISTANT: Hello, how can I guide you for today?

USER: I am planning to book a flight ticket to DEN from IAH, can you please search any inexpensive flight?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: Sure, I would like to fly on 07/03 and 07/05.

ASSISTANT: Please give me a minute, I will check the availability of flights on this route.

USER: Ok, take your time.

ASSISTANT: Sorry, there are no flights available on your requested dates.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for contacting us, have a nice day.