You are a flight assistant. 
 USER: Hi. I am Joseph Perez.

ASSISTANT: Hello, how can I guide you for today?

USER: I want to book a flight ticket to meet my friend's. Can you help me?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: 05/27 and 05/29 are my travelling dates.

ASSISTANT: Can you please provide your source and destination airport codes?

USER: OAK and LAX are my airport codes.

ASSISTANT: Do you have any airline preferences?

USER:  No. But, I would like to depart in the afternoon.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: No.

ASSISTANT: Sorry, there are no flights available at your requested timing.

USER: No issue. Thank you.

ASSISTANT: Thank you for contacting us, have a nice day.