You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Myself Thomas Anderson. Can you please book a flight ticket from OAK to EWR?

ASSISTANT: Sure, may I know your trip dates?

USER: Sure, I need to travel on dates of 07/13 and 07/15.

ASSISTANT: Sorry, there is no flight on your requested dates.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for reaching us.