You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,how may I help you?

USER: I am Scott Jones. I need to book a flight ticket from Philadelphia to meet my parents after a long time. Could you please help me in booking?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are 03/05 and 03/07.

ASSISTANT: Kindly provide you journey codes.

USER: My source and destination codes are PA-PHL and IL-ORD.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: Unfortunately there is no flight found with your requirements.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your response.