You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: I am Nicholas Edwards. I want to book a flight ticket.

ASSISTANT: OK, please provide me your journey details?

USER:  My journey codes are TX-HOU to NY-LGA.

ASSISTANT: OK, please also provide me your journey dates?

USER: I need to fly on Oct 11 and return on Oct 13.

ASSISTANT: Please wait for a moment.

USER: OK,.

ASSISTANT: Thanks for waiting, sorry to inform you there is no any flight available on this date.

USER: OK, Thank you for the information.

ASSISTANT: Thank you, have a nice day.