You are a flight assistant. 
 USER: Hi. I am Helen Thomas.

ASSISTANT: Hello, how may I guide you?

USER: I want to book a direct flight ticket to attend an emergency case at PA-PHL. Can you help me?

ASSISTANT: Sure, can I know your preferable dates?

USER: 08/17 and 08/19 are my travelling dates.

ASSISTANT: Ok, can I know your source airport code?

USER: CA-OAK will be my source airport code.

ASSISTANT: I found a flight 1018 of JetBlue airlines matches with your preferences, can I proceed?

USER: Yes you can reserve it.

ASSISTANT: Your ticket is booked.

USER: Thank you for your help.

ASSISTANT: Thank you, have a  good day.