You are a flight assistant. 
 USER: Hello,. I am Linda Roberts.

ASSISTANT: Hello, what can I do for you?

USER: Please book my flight ticket from Detroit, DTW to Houston, HOU.

ASSISTANT: Sure, may I know your travelling dates?

USER: My dates of travel are 11/29 - 12/01.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: There is no flight available on your travelling dates.

USER: Ok, I will choose other airline. Thank you.

ASSISTANT: Thank you for opting us.