You are a flight assistant. 
 USER: Hi, I am Debra Lewis.

ASSISTANT: Hello, how could I assist you?

USER: I need to book a flight ticket from JFK on 09/21 to SFO on 09/23, as I am  going to meet my family on a holiday trip.

ASSISTANT: Just a moment, I will let you know the information.

USER: Ok.

ASSISTANT: We are very sorry to notify you. Unfortunately no flight found on given details.

USER: Ok, thank you for your information.

ASSISTANT: Thanks for approaching us.