You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Deborah Clark, planning on 07/12 to have fun with friends in TX - HOU. So, can you book me a flight?

ASSISTANT: Ok, please provide me your source details?

USER: My source airport is TX - IAH. Book me a return flight on 07/14.

ASSISTANT: Ok, wait a moment.

USER: Ok.

ASSISTANT: Sorry no flight found for you.

USER: It's ok not a problem. Thank you for the information.

ASSISTANT: Welcome, have a nice day.