You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I be a help for you?

USER: My name is Jessica Jackson, please book me a plane ticket from 06/27 to 06/29.

ASSISTANT: Sure, can you please mention your airport codes?

USER: Sure, my airport codes are from EWR to PHL.

ASSISTANT: Sorry, there are no flights available which matches with your requirements.

USER: No problem, thank you for the information.

ASSISTANT: Thank you, have a good day.