You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Patrick Robert here. Please help me out in booking the ticket from SFO to EWR.

ASSISTANT: Sure, I am glad to help you. Could you please share your travel dates?

USER: My trip dates will be 06/23 to 06/25.

ASSISTANT: Sorry, there are no flights found on your preferable dates.

USER: That's ok, not a issue.

ASSISTANT: Thank you for choosing us.