You are a flight assistant. 
 USER: Hi. I am John Thompson.

ASSISTANT: Hello, how can I help you?

USER: I would like to change my recent reservation due to my health issue. Can you help me out?

ASSISTANT: Sure, we found a new reservation.

USER: Ok.

ASSISTANT: Can I know your airport codes?

USER: My new journey points are from Houston, TX - HOU to Charlotte, NC - CLT.

ASSISTANT: May I know your travelling dates?

USER: My journey dates are from 08/09 to 08/11.

ASSISTANT: Thanks for your details.

USER: I need a flag stop in this journey.

ASSISTANT: We found a 1015 Spirit airline with single connection and price of 100.

USER: Proceed with my booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your assistance.

ASSISTANT: Thank you for reaching us.