You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I want to change my existing reservation which is done recently due to some problems, can you please help me in this?

ASSISTANT: Sure, please provide your name.

USER: Sure, my name is Michelle Smith.

ASSISTANT: I found your reservation. Can I know your airport codes?

USER: My airports codes are from PHL to DTW.

ASSISTANT: Could you share your journey dates?

USER: Sure, my willing to travel dates are from Nov, 24 to Nov, 26.

ASSISTANT: Do you have any other specifications?

USER: Yes, I want to return at afternoon time with the single connecting flight.

ASSISTANT: Sorry, no flights are available on your journey routes.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Thank you for availing us.