You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Myself Robert Hernandez, can you help me to book a flight ticket from IAH to SEA?

ASSISTANT: Sure, I am at your service to help you. Can you please provide your planned dates?

USER: Ok, please book for the dates 12/24 and 12/26.

ASSISTANT: Ok, please wait for a moment. I am sorry to inform you that there is no flight available at your requested dates.

USER: Ok, not a issue. Thank you for the information.

ASSISTANT: Most welcome, have a nice day.