You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. In which way I can assist you today?

USER: Katherine Parker here.

ASSISTANT: Welcome to flight booking agency Parker.

USER: I want to travel from OAK to LAX for attending a Marriage. Can you please help me for that?

ASSISTANT: Sure, I am glad to help you with that.

USER: Thanks.

ASSISTANT: Can you please provide your planned dates of travelling?

USER: My travelling dates are from 01/07 to 01/09.

ASSISTANT: Ok, may I know your origin and destination airport codes for booking?

USER: My airport codes are from OAK to LAX.

ASSISTANT: Please wait a moment to check the flights availability in your travel route.

USER: Ok, I will wait.

ASSISTANT: We regret to inform you that there are no flights moving to your region with your requested dates of travelling.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us, hope you have a great day.