You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how are you?

USER: I am Amanda Perez. I want a flight ticket from IAH to LAS, can you help me?

ASSISTANT: Yes, I am happy to help you. Could you please provide me the travelling dates for easy search of the flight?

USER: Sure, my travelling dates are from 11/12 to 11/14.

ASSISTANT: Sorry to inform you Perez, there are no flights available with the dates you planned.

USER: It's ok. Thank you.

ASSISTANT: Thank you for contacting us.