You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I be a help for you?

USER: I am planning to go for my pod lead marriage ceremony on 12/27, so I need to go for Las Vegas.Can you please search a flight ticket for me?

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: I want to start my journey from work location TX-DFW and I want to go for NV-LAS?

ASSISTANT: Can you please provide your travelling dates?

USER: My travel dates are 12/26 and 12/28.

ASSISTANT: May I know your good name please?

USER: Myself Kathleen Harris. Please make sure that price of the ticket should be 200.

ASSISTANT: Sorry, there is no flight available with your requested fare.

USER: Ok, fine.Thank you for your help.

ASSISTANT: Most welcome. Have a great day.