You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Nancy Hernandez here.

ASSISTANT: How can I help you today?

USER: Due to sudden work, I need to change my reservation.

ASSISTANT: Ok.

USER: Can you please help me with it?

ASSISTANT: Sure, I am here to help you. Give me a minute to check the reservation on your name.

USER: Ok.

ASSISTANT: I am happy to inform you that, we found a reservation on your name. Can you please share your new journey dates?

USER: My travelling dates will be on 01/25 to 01/27.

ASSISTANT: Let me know your source and destination airport codes?

USER: My journey starts from SFO to EWR.

ASSISTANT: Please, standby.

USER: Ok.

ASSISTANT: Thanks for your time, there is a connecting flight of Southwest airline available with fare 100 in economy class. May I proceed with booking?

USER: You can proceed to booking.

ASSISTANT: Your reservation has been successfully changed and confirmed with flight umber 1011.

USER: Thank you for your help.

ASSISTANT: Thank you for opting us.