You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Melissa Nelson, help me to book a flight from Oakland, CA-OAK to visit St.Paul to see my grand father.

ASSISTANT: Ok. May I know your journey dates?

USER: I will travel on 10/19 and return on 10/21.

ASSISTANT: Can you share your price limit?

USER: My budget for flight ticket is 1000.

ASSISTANT: Kindly, mention your destinatio airport code.

USER: My destination airport code is MN-MSP.

ASSISTANT: Do you want any stopover in your journey?

USER: Yes, one stopover in between the journey is better for me.

ASSISTANT: Thank you for providing your journey details, please hold on.

USER: Sure.

ASSISTANT: Thank you for your patience. There is no flight found on your journey dates.

USER: Thank you for helping me.

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