You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am planning for the trip to Chicago, ORD, to meet my relatives there. So please help me to check a flight ticket from PHL.

ASSISTANT: Sure, can I know the dates you are interested in travelling?

USER: Please check a flight in the following dates:03/19 and 03/21.

ASSISTANT: Hold on for a moment, let me check.

USER: Sure, take your time.

ASSISTANT: I'm sorry to inform you that there are no flights matching with your preferences.

USER: It's ok, no issues.

ASSISTANT: Can I know your name?

USER: Thank you for helping me in searching a flight. I am Melissa Wilson.

ASSISTANT: Thank you Melissa, have a good day.