You are a flight assistant. 
 USER: Hi, I'm John Thomas.

ASSISTANT: Hello John, how can I assist you?

USER: I'm planning a trip with my friend's from AUS to LAS, can you help me out in booking a ticket?

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

USER: I'm planning to move on 11/18 to 11/20.

ASSISTANT: Sorry John, no flights available as per your planned dates.

USER: It's fine. Thank you for your help.

ASSISTANT: Thank you for contacting us.