You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Can you change my reservation?

ASSISTANT: Sure, I am here to help you for this. Let me check your reservation status in our records.

USER: Ok.

ASSISTANT: May I know your name please?

USER: Samuel Young.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: I found your reservation. May I know your new airport codes?

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

ASSISTANT: Could you please share me your travel dates?

USER: My travel dates are July 5th and July 7th.

ASSISTANT: Do you have any criteria, regarding your journey?

USER: I need a connecting flight to reach my destination.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: Sorry to inform, no flights are found with your criteria.

USER: Ok, not a problem.

ASSISTANT: Thank you very much for contacting our agency.

USER: Thank you for the information.

ASSISTANT: You are welcome.