You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Actually, I need to amend an existing reservation which is done due to health issues, can you please help me out?

ASSISTANT: Sure, may I know your good name?

USER: Sure, my name is Alexander Perez.

ASSISTANT: We found a reservation on your good name.

USER: Ok.

ASSISTANT: Please share me your source and destination points.

USER: My airport codes are CLT and BOS respectively.

ASSISTANT: May I know your planned travel dates?

USER: My planned travelling dates are 11/18 and 11/20.

ASSISTANT: Do you have any other specifications?

USER: Flight has to be with a single connection.

ASSISTANT: Please wait for a moment.

USER: Sure, I will wait.I used to prefer business class to travel.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.