You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Dorothy Campbell.

ASSISTANT: How can I help you at this moment?

USER:  I would like to enjoy my weekend trip with my friends. Can you please book a ticket within the price of 500?

ASSISTANT: Sure, I will you to book a flight. Can you please share me your travelling dates to search a flight on your dates?

USER: My travelling dates are 05/27 and 05/29.

ASSISTANT: Please give me a moment.

USER: Ok, take your time.

ASSISTANT: Ok, please share me your travelling airport codes for proceeding further?

USER: My travelling airport codes are from CLT to PHX.

ASSISTANT: Thank you for your patience, no flights are available on your route.

USER: Not an issue, I will any other way to reach my destination on time. Thank you for your information.

ASSISTANT: Sorry for inconvenience.

USER: That's ok, thank you.

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