You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,how may I help you?

USER: Matthew  Campbell here, I like to go outstation from DFW to HOU.

ASSISTANT: OK,may I know the dates when you want to go?

USER: 07/10 to 07/12.

ASSISTANT: I am really sorry Campbell to tell you that there is no flight available on your provided dates.

USER: Oh! It's OK. Thank you for your information.

ASSISTANT: Have a nice day.