You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Frank Smith.

ASSISTANT: How can I assist you at this moment?

USER: I need to fly from IAH to LAS, can you please book a flight ticket?

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates?

USER: Sure, my journey dates are May 30 and June 01.

ASSISTANT: Do you need any halt in this journey?

USER: No.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Frank Smith, there are no flight services available on this route on your provided dates.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for opting us.