You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: I need a flight ticket to meet my uncle at Dallas. Help me out with booking.

ASSISTANT: Sure, can you provide me your travelling dates?

USER: My preferred travelling dates are from 03/01 to 03/03. I need a direct flight.

ASSISTANT: OK, do you have any price limit?

USER: I need the ticket within price 500.

ASSISTANT: OK, provide me your airport codes?

USER: My source point is TX- IAH and destination point is TX- DFW.

ASSISTANT: OK, please wait for few minutes, let me check and revert you.

USER: Ok.

ASSISTANT: Sorry to say you that there are no flights with your requirements.

USER: Ok, no issues.

ASSISTANT: Can I know your good name?

USER: Thank you for your service. I am Samuel Anderson.

ASSISTANT: Thank you, for reaching us.