You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Joshua Rodriguez.

ASSISTANT: How may help you now?

USER: I am looking for a flight from CLT to OAK, can you help me out?

ASSISTANT: Sure, please provide your departure and return dates of travelling.

USER: My travelling dates are from 03/04 till 03/06.

ASSISTANT: Please wait a moment to check the flights availability.

USER: Sure.

ASSISTANT: We regret to inform you that there is no flights moving to your region with your planned dates of travelling.

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

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