You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I would like to change my existing reservation. Can you assist me in this?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Could you please provide your name?

USER: Sure, I am Edward Gonzalez.

ASSISTANT: Thank you, please wait a while.

USER: It's ok.

ASSISTANT: Thank you for waiting us. We will found a reservation on your name, please provide me your new journey details.

USER: My trip dates are 07/18 - 07/20. I want to fly from San Francisco, CA - SFO to reach Washington, DC - IAD.

ASSISTANT: Thank you for provide the details,please wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting us. We found  1004 JetBlue airline with single connection and price of 100. Shell I proceed with booking.

USER: Please proceed to book.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your response.

ASSISTANT: Thank you for choosing us.