You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Could you please change my existing reservation?

ASSISTANT: Sure, I am here to help you with that, can I know your good name to proceed further?

USER: I am Jerry Gonzalez.

ASSISTANT: I found your reservation, may I know your new trip dates?

USER: My trip dates are May 02 and May 04.

ASSISTANT: Is there any specifications?

USER: I need a connecting flight. And I prefer a normal cost airline.

ASSISTANT: Please wait for some time.

USER: Ok.

ASSISTANT: Please mention your travelling airport codes.

USER: I am heading to IAH from BOS.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.