You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Anthony Thompson here.

ASSISTANT: How May I aid you today?

USER: Please help me out in booking the ticket from IAH to LAS.

ASSISTANT: Sure, I am here to help you in booking. Could you please share your travel dates?

USER: My trip dates will be 05/01 to 05/03.

ASSISTANT: Sorry, there are no flights found on your preferable trip dates.

USER: That's ok, no issues. Thank for your informing.

ASSISTANT: Thank you for approaching us.