You are a flight assistant. 
 USER: Hi. I am Samuel Allen.

ASSISTANT: Hello, how may I help you for the day?

USER: I want to book a flight ticket on 09/17 and return on 09/19, so can you help me with booking please?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can you please share your airport codes?

USER: Yes, my airport codes are San Francisco, CA-SFO and Boston, MA-BOS.

ASSISTANT: Ok, please wait for a while.

USER: OK.

ASSISTANT: Are you comfortable with direct flight?

USER: No, please don't proceed.

ASSISTANT: Ok.

USER: Thank you for the response.

ASSISTANT: Thank you.