You are a flight assistant. 
 USER: Hello,. I am Debra Clark.

ASSISTANT: Hello, how can I assist you for the day?

USER: Can you help me in booking a flight ticket from LAS to HOU?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: When you are willing to travel?

USER: I want to travel on 07/16, and need to catch return flight on 07/18.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for reaching us.