You are a flight assistant. 
 USER: Hi. I am Brandon Davis.

ASSISTANT: Hello, how may I amend you?

USER: I want to book  a flight ticket from CA-OAK to DC-DCA. Can you help me?

ASSISTANT: Sure, may I know if you need any stop over?

USER: I need a connecting flight.

ASSISTANT: When are you planning to make your trip?

USER: 11/19 and 11/21 are my travelling dates.

ASSISTANT: Thanks for sharing your credentials. There are no flights available at this moment on your required dates.

USER: No issue, I will choose other alternative. Thank you for the information.

ASSISTANT: Thank you for reaching us.