You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you at this moment?

USER: I am Scott Perez here, I want to reserve my ticket from CLT to DEN, can you please help me to book a ticket?

ASSISTANT: Sure, I am glad to help you with that.

USER: Thank you.

ASSISTANT: Can you please provide your planned dates of travelling?

USER: Ok, my preferable dates of journey is from 03/05 to 03/07.

ASSISTANT: Please wait a moment to check the flights availability.

USER: Sure, but make sure that the price limit is 500.

ASSISTANT: Sorry for the trouble caused to you. There are no flights moving to your region with your planned dates of travelling.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Thank you for approaching us, hope you have a great day.