You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Samantha Allen, want to travel from EWR to LAS. Please help me in booking.

ASSISTANT: On which dates you are willing to travel?

USER: My travelling dates are from 11/01 to 11/03.

ASSISTANT: Sorry, there is no flights available.

USER: It's ok, thank you.

ASSISTANT: Most welcome.