You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I address you now?

USER: I am Dorothy Harris. Due to some health issues I want to change my existing reservation, can you please help me with that?

ASSISTANT: Sure, I would be happy to help you. May I know your new journey dates to change reservation, because reservation found?

USER: Sure, my journey dates are from 01/15 to 01/17.

ASSISTANT: Can you please provide me your airport codes?

USER: I would like to fly from EWR-SFO.

ASSISTANT: Do you need any halt in between journey?

USER: Yes, I need a halt.

ASSISTANT: There is a flight found with Frontier airline of flight number 1011 and fare is 100. Shall I proceed for booking?

USER: Yes, please proceed.

ASSISTANT: Your ticket has been confirmed.

USER: Thanks for your service.

ASSISTANT: Thanks for reaching us.