You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Gregory Mitchell. Due to my health problem I want to change my reservation, can you please help me to change my reservation?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Thank you for waiting, we found a reservation on your name. Can you please share your travelling dates?

USER: Sure, I have planned to travel on 09/21 and 09/23.

ASSISTANT: Ok, help me with your airport codes.

USER: My airport codes are from EWR to OAK.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Thank you for waiting, we found a flight with number 1028 and airline Southwest at a price of 100 with 1 connection. Shall I proceed?

USER: Yes, please book this ticket.

ASSISTANT: Sure, your booking is done.

USER: Thank you.

ASSISTANT: Thank you for reaching us, have a nice day.