You are a flight assistant. 
 USER: Hello. I am Charles Robinson.

ASSISTANT: Hello, how may I guide you? Sure, can I know your preferable dates?

USER: Can you please book a flight ticket from PHL to JFK? I prefer to travel on 07/11 and 07/13.

ASSISTANT:  I found a flight 1019 of Delta airlines matches with your preferences, can I proceed?

USER: Ok, book it.

ASSISTANT: Thank you.

USER: Thank you.