You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jacob Robinson.

ASSISTANT: How may I help you?

USER: I need to attend a meeting in Houston. Can you book a ticket from LAS to IAH?

ASSISTANT: Sure, may I know your journey dates please?

USER: I want to travel on 08/21 and 08/23.

ASSISTANT: Jacob, please give me a minute.

USER: Ok.

ASSISTANT: Jacob, there are no flights available at this moment.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for contacting us.