You are a flight assistant. 
 USER: Hello, I am Sarah Hernandez.

ASSISTANT: Hello, how can I render you today?

USER: Please book a flight ticket on dates 09/19 and 09/21.

ASSISTANT: Sure, please share your source and destination airport codes.

USER: Sure, my airport codes are NY-EWR and CA-SFO.

ASSISTANT: Please wait.

USER: Ok.

ASSISTANT: We have a connecting flight from Frontier airline number 1017 and the price is 100. Shall I proceed?

USER: Yes, please.

ASSISTANT: Your economy class ticket is reserved.

USER: Thank you.

ASSISTANT: Thank you for opting us.