You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am Edward Davis here. I want to reserve my ticket from CLT to PHX, can you please help me to book a ticket?

ASSISTANT: Sure Davis, can I know the travel dates please?

USER: Ok, my dates of journey is from 02/21 to 02/23.

ASSISTANT: Ok, wait a moment please.

USER: Sure, take your time.

ASSISTANT: There is a flight in Spirit airline with price 600, can I book it?

USER: Do not book this ticket. Because my price limit is 500.

ASSISTANT: Sorry, there are no flights available with price limit 500.

USER: Ok, no problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your information.