You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you today?

USER: Can you reserve me a ticket from IAD to DFW?

ASSISTANT: Sure, on which dates are you travelling?

USER: My trip dates are July 30 to Aug 01.

ASSISTANT: Is there any class preference?

USER: I need a direct flight.

ASSISTANT: Ok, is there any class preference?

USER: No.

ASSISTANT: Do you have any specific travel timings?

USER: No.

ASSISTANT: Would you like to travel in any specific airline?

USER: No, please proceed with above details.

ASSISTANT: Can you share your name to proceed further?

USER: Brandon Collins here.

ASSISTANT: Sorry, no flights found with your requirements.

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

ASSISTANT: Thank you for contacting us.