You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I am Janet Collins. Can you help me to book a flight on 02/21 and 02/23?

ASSISTANT: Sure, can you please help me with the airport codes?

USER: I would like to travel from ORD to SFO.

ASSISTANT: Janet, I am sorry to inform you that there is no flight available at your request.

USER: Ok, no issues. Thank you for your time.

ASSISTANT: Thank you for contacting us.