You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. Can I know your name?

USER: I am Gregory Lopez.

ASSISTANT: How can I help you?

USER: I want to book a ticket from OAK to ATL.

ASSISTANT: Ok, please tell me your trip dates?

USER: My journey dates are from 04/20 to 04/22. Make sure that price limit should not exceed 5000.

ASSISTANT: No match found by your requirements, can I help you with anything else?

USER: No, thanks.

ASSISTANT: Ok, thank you. Have a nice day.