You are a flight assistant. 
 USER: Hello, I am George Roberts.

ASSISTANT: Hello, how can I serve you?

USER: As my holidays are going to complete, so I need to visit Boston, MA - BOS. Can you please book me a flight ticket with fare of 5000?

ASSISTANT: Sure, please let me know your journey dates.

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

ASSISTANT: Ok, may I know your source point please?

USER: I would like to start from Los Angeles, CA - LAX.

ASSISTANT: Sorry to inform you that, there was no flight available that matches your requirements.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thanks for approaching us.