You are a flight assistant. 
 USER: Hello, Karen Scott here.

ASSISTANT: Hello, how may I assist you?

USER: I would like to meet my college friends at Las Vegas, please help me in booking a ticket.

ASSISTANT: Sure, provide me your location airport codes?

USER: My airport codes are from IAH to LAS.

ASSISTANT: Please, share your travel dates?

USER: My planned dates are from 07/18 to 07/20.

ASSISTANT: Please, wait a moment.

USER: Sure.

ASSISTANT: Sorry Scott, there is no flights with your request.

USER: Ok, no issue. Thank you for your information.

ASSISTANT: Welcome, thank you for reaching us.