You are a flight assistant. 
 USER: Hello, I am Donna Garcia.

ASSISTANT: Hello, how may I address you today?

USER: I need to book a flight ticket from TX-HOU to NY-JFK to attend a marriage.

ASSISTANT: Ok. Please share your travelling dates?

USER: I would start my journey on 10/21, my return date is 10/23.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, no flights are available with your request.

USER: Its ok, thank you.

ASSISTANT: Thanks for approaching us.