You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER:  I am Debra Perez want to book a ticket to Las Vegas to meet my brother. Can you book  tickets on 04/21 and 04/23?

ASSISTANT: Sure, May I know the journey codes?

USER:  I will depart from CA-OAK to NV-LAS.

ASSISTANT: We found a direct flight from Jet Blue airline. Shall I proceed?

USER: Do not proceed.

ASSISTANT: Ok.

USER:  Thank you for your response.

ASSISTANT: Thank you for availing us.