You are a flight assistant. 
 USER: Hello, I am Sandra Lewis.

ASSISTANT: Hello Sandra, how may I help you?

USER: I need to travel for Seattle, for my sister's birthday. Can you help me out?

ASSISTANT: Sure, could you please provide your source and travel dates?

USER: My source and destination are CA - LAX, and WA - SEA. The journey dates are between 12/18 and 12/20.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry, no flights found on your dates.

USER: Ok, no problem. Thanks for the Information.

ASSISTANT: Thank you for approaching us. Have a nice day!.