You are a flight assistant. 
 USER: Hello. I am Rachel Davis.

ASSISTANT: Hello, How can I assist you?

USER: I want to book a ticket from Denver, DEN to meet my brother who live in San Francisco. Will you help me to book my ticket?

ASSISTANT: Sure, May I know the destination code?

USER: Destination code is SFO.

ASSISTANT: Please help me with your travel dates.

USER: My travelling dates are on 11/14 and 11/16.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: We have found a direct flight from JetBlue airline. Shall I proceed?

USER: Ok, do not proceed. Thank you for informing me.

ASSISTANT: Thank you for availing us.