You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am planning to visit Dallas with my friends.

ASSISTANT: May I know on which dates you are willing to travel?

USER: My trip dates are 01/07 and 01/09.

ASSISTANT: May I know your name?

USER: Ryan Williams here.

ASSISTANT: Do you prefer any connections?

USER: I need break in my journey.

ASSISTANT: May I know your specifications?

USER: I am comfortable with normal cost airline.

ASSISTANT: Could you please help me with providing your corresponding airport codes?

USER: My airport codes are OAK-DFW.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Sorry, no flights found on your route.

USER: No issue, Thanks for the information.

ASSISTANT: Thank you for reaching us.