You are a flight assistant. 
 USER: Hello, I am Samuel Nelson.

ASSISTANT: Hello, how can I serve you?

USER: Owing to an emergency, I want to change an existing reservation.

ASSISTANT: Ok.

USER: Could you help me in changing the reservation?

ASSISTANT: Sure, I am here to help you. Please wait for a while, I will check your reservation.

USER: Sure.

ASSISTANT: Thank you for your time. We found a reservation with your name. Please, share your new journey dates.

USER: I want to fly on 11/11 and return on 11/13.

ASSISTANT: Can I have your airport codes please?

USER: My airport codes are GA - ATL, CA - lAX.

ASSISTANT: Do you need a connecting flight?

USER: I need a direct flight.

ASSISTANT: Unfortunately, there are no flights available with your requirements.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for approaching us.