You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Kevin Lee, want to book a ticket to San Francisco with the price under 1000. can you help me with it?

ASSISTANT: Sure, may I know your travel dates please?

USER: Travel dates are 02/17 and 02/19.

ASSISTANT: Could you please provide me your airport codes?

USER: Sure, my airport codes are DTW-SFO.

ASSISTANT: Do you have any specification?

USER: I need a single connection in between the journey.

ASSISTANT: Thanks for giving your details, unfortunately there is no flight on your data.

USER: Ok, no issues.

ASSISTANT: Thanks for choosing us.

USER: Thank you.

ASSISTANT: Have a good day.