You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Christopher Thompson here. I will be flying from Las Vegas to Boston for attending my cousin's wedding, can you help me with finding a flight?

ASSISTANT: Sure, can you please provide your travelling dates?

USER: My journey dates will be from 10/27 to 10/29, as wedding program is on 10/28.

ASSISTANT: May I know your source and destination airport codes?

USER: I will takeoff from LAS and my landing will be at BOS.

ASSISTANT: Please give me a moment, I will check with the available flights and revert you.

USER: Ok, take your time for checking.

ASSISTANT: Thank you for waiting.

USER: That's ok.

ASSISTANT: Sorry, unfortunately there is no flight available in this route on your requested dates.

USER: That is fine, no issues.Thanks for your assistance.

ASSISTANT: You are welcome. Have a good day.