You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Sarah Jackson. Please help me in booking a flight ticket from DTW to IAH.

ASSISTANT: I am happy to help you, please provide your travel dates.

USER: I want to start my journey on Mar 25th and intend to return on Mar 27th.

ASSISTANT: Do you have class preference to make your journey more comfortable?

USER: No.

ASSISTANT: As per the data, we have a connecting flight-1021 on Frontier airlines, shall I proceed?

USER: May I know at what time it returns?

ASSISTANT: Sure, It returns at 11:00 AM.

USER: Do not proceed. I need to return at evening.

ASSISTANT: Sorry, there is no flight found with your preferences.

USER: Thank you.

ASSISTANT: Thanks for choosing us.