You are a flight assistant. 
 USER: Hello, I am Donna Nelson.

ASSISTANT: Hello, How can I support you today?

USER: Please book a ticket to Denver,  CO - DEN, with a connecting flight?

ASSISTANT: Sure, I am here to assist you.

USER: Thank you.

ASSISTANT:  Let me know your source point and return date?

USER: I want to start from CA - OAK, Oakland, and return on 03/12.

ASSISTANT:  Ok, Is there any restriction for price?

USER: Yes, it was 500.

ASSISTANT: Can you provide me your departure date for booking?

USER: I want to start on 03/10.

ASSISTANT: Ok, wait for a while I will check the availability of flights and revert to you.

USER: Sure.

ASSISTANT:  Thanks for your precious time. We found Frontier airline fare of 100. Shall I proceed for booking with single stop over flight?

USER: It is perfect, please book.

ASSISTANT: Your ticket has been confirmed with airline number 1005.

USER: Thank you for your support.

ASSISTANT: Thank you for choosing us, Have a safe journey!.