You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to book a flight ticket from IAH to DFW to meet my grand parents. Could you please help me with booking a flight ticket?

ASSISTANT: Sure, I will help you in booking. When would you like to travel?

USER: I want to travel on dates Mar 27 and Mar 29.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: Is there any other requirements, please let me know?

USER: I prefer to travel in a direct flight.

ASSISTANT: Please provide your good name.

USER: I am Debra Adams.

ASSISTANT: Unfortunately there is no flight available on your route according to your given dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you.