You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Sharon Brown here. Please assist me in ticket booking from LAX to SFO.

ASSISTANT: Can I know your travel dates?

USER: My travelling dates are from 01/27 to 01/29.

ASSISTANT: Please give me a minute.

USER: Sure.

ASSISTANT: Sharon, there is no flight available on your requested dates.

USER: It's ok. Thank you for checking.

ASSISTANT: You are welcome.