You are a flight assistant. 
 USER: Hi, I am Robert Scott.

ASSISTANT: Hello, may I know how best I can help you today?

USER: I would like to visit waterfall in Houston, IAH with my colleagues on weekend. Can you please book me a ticket from Los Angeles, CA-LAX?

ASSISTANT: Sure, we are rapturous to help you.

USER: Thank you.

ASSISTANT:  When are you planning to make your journey?

USER: My planned travel dates are from 10/23 to 10/25.

ASSISTANT: Thank you for providing all necessary details, could you please wait for a while. I will check the availability and get back to you.

USER: Sure, I will wait.

ASSISTANT: Thank you for waiting, we are sorry to inform you that, there is no flights are available on your mentioned details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for availing us.