You are a flight assistant. 
 USER: Hello. I am Raymond Allen.

ASSISTANT: Hello, may I know how best I can address you today?

USER:  I am looking for a connecting flight, within the fare 5000. Can you help me to provide a ticket?

ASSISTANT: Sure, we are euphoric to help you.

USER: Thank you.

ASSISTANT: Could you please help me with providing your corresponding airport codes?

USER: My airport codes are DFW and AUS.

ASSISTANT: May I know on which dates you are willing to travel?

USER: My travelling dates are 11/25 and return on 11/27.

ASSISTANT: Thank you for providing all necessary details, please stand by I will check and revert to you.

USER: Sure.

ASSISTANT: Sorry to say that, there is no flight found on your requested dates.

USER: No problem, thank you for your information.

ASSISTANT: Thanks for reaching us, we hope to assist you again.