You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I want to go to DFW from SFO for my certificate verification. Can you help me out?

ASSISTANT: Sure, I can help you. May I know your travel dates?

USER: Ok, my trip dates are from 11/13 till 11/15.

ASSISTANT: Please give me a minute to check for availabale flights.

USER: Myself Eric Lee.

ASSISTANT: Sorry Lee, no flight is available on your planned dates.

USER: That's ok, no problem. Thank you for checking.

ASSISTANT: Thank you for reaching us, have a nice day.