You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Timothy Green here, can you help me to book a flight ticket from LAX to OAK?

ASSISTANT: Sure, when would you like to travel please?

USER: OK, my travel dates are 05/24 and 05/26 respectively.

ASSISTANT: Please wait for a while to check a flight availability.

USER: Yes, take your time.

ASSISTANT: Sorry, as per your request there are no flights available.

USER: Ok, thank you for the information. I will check with other source to book my ticket.

ASSISTANT: Thank you and have a nice day.