You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I help you with today?

USER: Could you please help me in booking a ticket. ?

ASSISTANT: Sure, I can help you with that. May I know your name to proceed further?

USER: My name is Ruth wilson.

ASSISTANT: Thank you for providing. Can you please provide the source and the destination codes?

USER: I am planing to travel from MI-DTW to TX-HOU.

ASSISTANT: Sure, could you please help me with the travelling dates?

USER: My dates of  journey is 03/18 to 03/20.

ASSISTANT: OK. Let me check that for you. Ruth, I am sorry to inform you that there is no flight available at your request.

USER: Ok,Thank you.

ASSISTANT: You're welcome. Have a great journey.