You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Alexander Thomas.

ASSISTANT: How can I help you today?

USER: I am planning to visit DFW to meet my father, can you please find a flight from OAK?

ASSISTANT: Sure, I will help you in booking. Can I have your travel dates?

USER: My planning dates are from 03/16 till 03/18.

ASSISTANT: Sorry, no flights are available on your planned dates.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.