You are a flight assistant. 
 USER: Hello.

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

USER: I am looking for a direct flight from Dallas, please help me in booking a ticket from DFW to LAX.

ASSISTANT: Sure, can you please mention your name?

USER: My name is Ryan King.

ASSISTANT: Can you please tell your travelling dates?

USER: My planned travel dates are Jan 29 and return on Jan 31.

ASSISTANT: Do you prefer any class?

USER: Any class is comfortable for me.

ASSISTANT: Ok, I will help you in booking a flight ticket.

USER: Thank you.

ASSISTANT: Sorry, we did not found any flight with your requirement.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for approaching us.