You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: My name is Margaret Lopez. I am looking for a connecting flight from PHL to LAX, can you help me to book a flight ticket?

ASSISTANT: Sure, can you please share your travel dates?

USER: Ok, my travelling dates are from 11/29 to 12/01.

ASSISTANT: Let me check for the availability of flight.

USER: Ok, take your time.

ASSISTANT: Margaret, I am sorry to inform you that there is no flight available at your requested dates.

USER: Ok, no problem. Thank you for your help.

ASSISTANT: Thank you for contacting us, have a great day.