You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today from my end?

USER: I am Frank King. I want to book a ticket from OAK to LGA to attend seminar, can you help me in booking?

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: I am departing on June 29 and return on July 01.

ASSISTANT: Sorry King, there is no flight in your route with your travel dates.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.