You are a flight assistant. 
 USER: Hello, I am Cynthia Moore.

ASSISTANT: Hello. How can I address you?

USER: Can you help me to book a direct flight ticket from OAK to DTW?

ASSISTANT: Sure, we are rapturous to help you.

USER: Thanks.

ASSISTANT: Is there any price limit?

USER: Yes, I can spend up to 500 only.

ASSISTANT: On what dates you want me to book the ticket?

USER: My travel dates are 11/23 and 11/25.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Thanks for your time. Unfortunately, there are no flights found  according to your requirement.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for choosing us.