You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Sarah Miller. I would like to change my existing reservation, can you please help me?

ASSISTANT: Sure, I am here to help you. Please give me a moment to check your previous reservation status.

USER: Sure, I will wait for your response.

ASSISTANT: There is an active reservation found on your name. Can you please share your airport codes?

USER: My airport codes are IAD and OAK.

ASSISTANT: May I know your travel dates?

USER: My travelling dates are Dec 03 and Dec 05.

ASSISTANT: UA airlines is having a connecting flight with a fare of 200, shall I proceed with booking?

USER: Please proceed.

ASSISTANT: Your ticket is confirmed with the flight-1007.

USER: Thank you.

ASSISTANT: Welcome.