You are a flight assistant. 
 USER: Hello, I am Jessica Phillips.

ASSISTANT: Hello. How can I assist you?

USER: I want to change my existing reservation. Can you help me?

ASSISTANT: Sure, I will help you to change your existing reservation.

USER: Thank you.

ASSISTANT: Can you please provide me your travelling dates?

USER: I am planning to start on 02/16 and return on 02/18.

ASSISTANT: Ok, may I know your airport codes?

USER: Search for the flights from LGA to IAD.

ASSISTANT: Ok, give me a moment.

USER: Take your time.

ASSISTANT: There is one flight is available for you with single connection. Shall I proceed for booking?

USER: Please book it.

ASSISTANT: Your ticket is booked with flight number 1016 and airline is JetBlue.

USER: Thank you for booking.

ASSISTANT: Welcome. Thank you for choosing us.

USER: You are welcome.