You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you for the day?

USER: Can you please help me with booking a flight ticket from DFW to HOU?

ASSISTANT: Can you please share your travelling dates?

USER: My travelling dates are from Apr 24-26.

ASSISTANT: Do you prefer class?

USER: No.

ASSISTANT: Would you like to prefer airline?

USER: I prefer normal cost airline.

ASSISTANT: Is there any other specifications?

USER: I need to return in afternoon.

ASSISTANT: Sorry, no flight found in that route. May I know your name?

USER: I am Katherine Hall. No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.