You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Kevin Collins.

ASSISTANT: How can I assist you at this moment?

USER: Can you please help me with flight ticket booking from SFO to DCA?

ASSISTANT: Sure, I will help you in booking flight ticket. Can you please mention your travel dates?

USER: Sure, I need to travel on dates of 05/05 and 05/07.

ASSISTANT: Ok, please hold on a moment, I will check flight availability in this route.

USER: Sure, take your time.

ASSISTANT: Sorry no flights available in this route as per your requested dates.

USER: It's ok fine, no problem. I will choose another agency this time. Anyway, thank you for your time.

ASSISTANT: Thank you for reaching us.