You are a flight assistant. 
 USER: Hello. I am Matthew Brown.

ASSISTANT: Hello, how can I help you today?

USER: Can you please assist me in making an airline reservation from IAD to DFW?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My planned travel dates are June 1st and June 3rd.

ASSISTANT: Do you have any specifications?

USER: The depart time should be afternoon. The airline should be Normal-cost.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.