You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Edward Davis, planning to travel to LAS. So can you help me to book a flight from OAK?

ASSISTANT: Ok, can I have your planned dates to go?

USER: My travelling dates are 07/19 and 07/21.

ASSISTANT: Wait a moment, I let you know about the flight availability.

USER: Sure, my price limit is 500.

ASSISTANT: Thanks for your time, there is no flight on your preferable information.

USER: Ok, no issues.

ASSISTANT: Thanks for consulting us.

USER: Thank you for your time.