You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER: Donald Wilson here. I want to attend a Marriage in Oakland. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am here to help you.

USER: Thanks.

ASSISTANT: May I know when you are willing to travel?

USER: My travelling dates are from 07/23 to 07/25.

ASSISTANT: Can you help me with your airport codes?

USER: My airport codes are from LAS to OAK.

ASSISTANT: Please wait for a moment.

USER: Ok, I will wait.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us.