You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to change my existing reservation due to some issues, can you please help me with that?

ASSISTANT: Sure, can I know your name?

USER: Sure, I am Dorothy Young.

ASSISTANT: We found reservation on your name, please provide your airport codes?

USER: Sure, I want to fly from HOU to SEA.

ASSISTANT: May I know your journey dates?

USER: My journey dates are Feb 15 and Feb 17.

ASSISTANT: Do you have any specifications?

USER: I need a flight with single connection.

ASSISTANT: United airlines flight- 1021 of price 100 with connection-1 in economy class matches your given details, shall I proceed?

USER: Go ahead.

ASSISTANT: Ok, your flight ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.