You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hi.

USER: I am Cynthia Smith.

ASSISTANT: How can I help you?

USER: Can you help me booking flight with 0 connection?

ASSISTANT: May I know your airport codes please?

USER: My travelling airport codes are BOS to SFO.

ASSISTANT: On which dates you like to travel?

USER: I am going to start my journey on 05/19 and I would like to return on 05/21.

ASSISTANT: I am sorry no flights with 0 connections.

USER: Oh! It's ok no problem, thank you for your services.

ASSISTANT: Thank you.