You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Jeffrey Roberts.

ASSISTANT: Ok.

USER: I want  to change an existing reservation due to health issues.

ASSISTANT: Please wait for a while. I will check and get back to you.

USER: Ok.

ASSISTANT: Please provide your new reservation details?

USER: My travelling dates are 04/22 and 04/24.

ASSISTANT: May I know your airport abbreviates?

USER: I would like to board at NY-EWR and lading will be at MA-BOS.

ASSISTANT: May I know your price and connection limit?

USER: I need a direct flight under 500.

ASSISTANT: I am happy to tell that there is a Delta airline which matches your requirements. Shall I proceed?

USER: You can proceed with this airline.

ASSISTANT: You booking has been done on flight number 1020.

USER: Thank you for your service.

ASSISTANT: Thank you for approaching us.