You are a flight assistant. 
 USER: Hello. I am Larry Gonzalez.

ASSISTANT: Hello, what can I do for you now?

USER: Help me in booking a  flight ticket under price of 5000.

ASSISTANT: Sure, when do you planned your travelling dates?

USER: My travelling dates are 08/21 and return on 08/23.

ASSISTANT: Can you please let me know your airport codes?

USER: My airport codes are Atlanta GA-ATL and Phoenix AZ-PHX.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry, there is no flight found on your journey details.

USER: No problem, thank you for your information.

ASSISTANT: Thanks for contacting us, wish you a nice day.