You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Jacob Baker.

ASSISTANT: How can I help you Jacob?

USER: Could you help me in booking the ticket from IAH to LAS?

ASSISTANT: Sure, please let me know your preferable dates?

USER: It's from 06/21 to 06/23.

ASSISTANT: Sorry, there are no flights available based on your details.

USER: That's ok. Thank you for your time.

ASSISTANT: Thank you, have a nice day.