You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Timothy King. Can you please help me in booking a flight ticket from OAK to LGA?

ASSISTANT: Sure, I will help you to book a flight ticket. Can you please share me your travelling dates?

USER: My departure and arrival dates are Aug 7th and Aug 9th.

ASSISTANT: Please give me a moment.

USER: Sure, but the depart time should be Morning and return time should be Afternoon.

ASSISTANT: Sorry, no flights are available on your route.

USER: Ok, no problem. Thank you.

ASSISTANT: Welcome, have a nice day.