You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Angela Robinson.

ASSISTANT: How may I assist you Angela?

USER: Can you please check whether any airline from SFO to reach DFW?

ASSISTANT: Sure, could you please provide your preferable dates for better search of a flight?

USER: Ok. Preferably, from 11/03 to 11/05.

ASSISTANT: Ok, please hold on a moment to check the availability of flights and I will revert you back.

USER: Ok.

ASSISTANT: Sorry to inform you, there are no flights moving with your requested dates of travelling.

USER: It's ok, no problem. I will choose other way to reach my destination. Thank you for your service.

ASSISTANT: Thank you for approaching us, have a great day.