You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Can you  please book a flight ticket from DEN to HOU?

ASSISTANT: Sure, may I know your travelling dates?

USER: Thank you. I have planned my travel  dates as Sept 08 and Sept 10.

ASSISTANT: Do you need any other specifications?

USER: I am looking for single connecting flight.

ASSISTANT: Please provide your name.

USER: Sure, myself Susan Perez.

ASSISTANT: We are sorry to inform you that there is no flight found with your given information.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for opting us.