You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Cynthia Collins.

ASSISTANT: How may I aid you today?

USER: I want to book a flight ticket to meet my uncle in Las Vegas, will you help me in booking a flight ticket with a price limit of 5000?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Could you please share your travelling dates?

USER: I want to travel on 05/26, and need to catch return flight on 05/28.

ASSISTANT: Please specify your airport codes?

USER:  I need to leave from my nearest airport DFW to reach LAS.

ASSISTANT: Thanks for your details, there is no flight found on your desired journey routes.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for reaching us.