You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am looking to book a flight ticket from DFW to IAH. Can you help me for that?

ASSISTANT: Sure, we are here to help you. Is there any class preference for you?

USER: I prefer to book a economy class.

ASSISTANT: May I know your itinerary dates?

USER: My travelling dates are Oct 06 and Oct 08.

ASSISTANT: May I know your airline preference?

USER: I don't have any airline preferences.

ASSISTANT: May I know your depart and arrival time?

USER: I have no time limit.

ASSISTANT: It will be helpful for me, If you share me your good name?

USER: My name is Linda Taylor.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.