You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Ryan Perez here, can you please reserve my ticket from OAK to HOU?

ASSISTANT: Sure, I will help you with booking, please share your travelling dates?

USER: Sure, my dates of journey is from 03/25 to 03/27. Please make sure that the price limit is 500.

ASSISTANT: Perez sorry for the inconvenience, no flights as per your details.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.