You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you with today?

USER: I am Amanda Thompson. Actually I want to visit my friend home.Can you help me to book a ticket?

ASSISTANT: Sure, I can help you with that. Amanda, can you please help me with source and the destination airport codes?

USER:  These are my soure and destination NY-EWR to NV-LAS.

ASSISTANT: Can you please help me with the travelling dates?

USER: My travelling dates are 06/06 to 06/08.

ASSISTANT: Thank you for providing. Let me check that for you.

USER: OK.

ASSISTANT: Amanda, I am sorry to inform you that there is no flight available at your requested dates.

USER: It's OK, Thank you for your help.

ASSISTANT: You are welcome. Thank you for contacting us.