You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, I am here to assist you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: John Perez here.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thank you for your time, we found a reservation on your name.

USER: Ok.

ASSISTANT: May I know your new journey dates?

USER: My trip dates are 05/01 - 05/03.

ASSISTANT: Ok, Kindly mention your source and destination.

USER: My airport codes are CLT - DTW.

ASSISTANT: Ok, Is there any other preferences?

USER: I need an economy class with a single connection.

ASSISTANT: Thank you for providing details, There were no flights found with your given requirements.

USER: No issues, thank you.

ASSISTANT: Thank you for availing us.