You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: Can you help me to change my reservation as my exams are postponed?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: May I know your name?

USER: David Thomas here.

ASSISTANT: I have found the reservation. Can I know your travelling dates?

USER: My travelling dates are Feb 17 and Feb 19.

ASSISTANT: Ok, can I know your airport codes?

USER: My airport codes are from HOU to CLT?

ASSISTANT: Do you have any other requirements?

USER: I need a connecting flight which returns in the morning.

ASSISTANT: May I know your depart and return timings? The American airlines are providing a flight having a connection limit 1. Can I proceed with the ticket booking?

USER: You can proceed.

ASSISTANT: Your ticket is reserved in an economy class and the flight number 1000.

USER: Thank you for booking.

ASSISTANT: Thank you for reaching us. Have a safe journey.