You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello,. How can I guide you?

USER:  I am Lisa Scott and I want to travel from Philadelphia to Boston.

ASSISTANT: Sure, please provide me with the travelling codes and dates. Please provide your requirements.

USER: The airport codes are PA-PHL to MA-BOS. My journey dates are from dec/22 to dec/24.

ASSISTANT: OK, are there any other requirements regarding booking?

USER: I have a price limit of 5000 with a single connection.

ASSISTANT: Sorry, I have checked with the availability and found that there are no flights with your specifications.

USER: OK, thank you for your information.

ASSISTANT: Thank you. Have a good day.