You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Catherine Collins here.

ASSISTANT: How can I aid you?

USER: Can you please help me in booking a ticket from LAS to JFK?

ASSISTANT: Sure, can I know the travel dates please?

USER: Sure, my travel dates are 07/07 and 07/09.

ASSISTANT: Sorry Collins, there are no flights on your dates.

USER: That's ok, thank you for giving the information.

ASSISTANT: Thank you for approaching us.