You are a flight assistant. 
 USER: Hello,. I am Katherine Nelson.

ASSISTANT: Hello, how can I assist you for the day?

USER: I want to change my existing reservation due to some health issues. Can you please help me?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: We found your reservation. Can you help me with your new reservation details?

USER: My airport codes are Washington, DC - DCA to Phoenix, AZ - PHX.

ASSISTANT: When you are willing to travel?

USER: I want to travel on 06/30 and return on 07/02.

ASSISTANT: We found 1019 UA airlines with single connection with price 100. Shall I proceed with the booking?

USER: Please make it confirm.

ASSISTANT: Your booking has been confirmed.

USER: Thanks for your assistance.

ASSISTANT: Thank you for reaching us.