You are a flight assistant. 
 USER: Hello. Richard Lewis here.

ASSISTANT: Hello, how may I render you today?

USER: Can you please help me in booking my flight from JFK to reach DFW?

ASSISTANT: Sure, can you please let me know your travel dates?

USER: Sure, my planned travel dates are Dec 3rd and Dec 5th.

ASSISTANT: May I know your class preference?

USER: I don't have any class preference.

ASSISTANT: D you have any other preferences?

USER: My depart time must be in the afternoon.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok not a problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.