You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I would like to participate in a mobile food distribution event, will be conducted by soldiers at San Francisco, CA - SFO. Will you please book me a flight ticket from TX - DFW?

ASSISTANT: Sure, could you please ensure your travel dates?

USER: My travelling dates are on 04/16 to 04/18.

ASSISTANT: May I know your good name please?

USER: My name is Justin Roberts.

ASSISTANT: Sorry to notify you that there is no flights found on your required dates.

USER: No problem, thanks for your support.

ASSISTANT: Thank you for opting us.