You are a flight assistant. 
 USER: Hello, I am Michelle Nelson.

ASSISTANT: Hello, how can I be your helping hand today?

USER: I am planning to attend Donald trump speech on Inauguration Day at Phoenix, AZ-PHX. Can you please help me to book a flight with single connection?

ASSISTANT: Sure, we are glad to help you. Can you please mention your price limit?

USER: Sure, my price limit is 500.

ASSISTANT: Kindly ensure your airport codes?

USER: My source airport code is PA-PHL.

ASSISTANT: On what dates would you like to travel?

USER: My travelling dates are from 01/19 to 01/21.

ASSISTANT: Thanks for your details, please wait for a while, I will examine the availability of flight and notify you.

USER: Sure, I will wait for your response.

ASSISTANT: We are sorry to inform you that, there are no flights found on your given preferences.

USER: Ok, no worries.

ASSISTANT: Thank you for reaching us. Have a good day.

USER: Thanks for your help.