You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Sandra Wright.

ASSISTANT: What type of service your expecting from us?

USER: I want to attend Religious festivals at LAS, Can you help me for booking a flight ticket please?

ASSISTANT: Sure, I am glad to help you with that. Can I know your journey dates?

USER: My trip dates are 08/20 to 08/22.

ASSISTANT: Ok, May I know your source code?

USER: I will start from SEA.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flight's available based on your journey details.

USER: No issue, thank you for checking.

ASSISTANT: Thank you for reaching us.