You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

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

ASSISTANT: Sure, I am here to help you with this. May I know your good name please?

USER: My name is Ruth Evans.

ASSISTANT: Please wait for a mean while.

USER: Sure.

ASSISTANT: There is a reservation found on your name to change, can you please help me with your dates of journey?

USER: I will start on Oct 26, return on Oct 28.

ASSISTANT: Ok, may I know your respective airport codes of journey please?

USER: My source and destination airport codes are DTW and SFO.

ASSISTANT: I found a connecting flight of fare 100 with the Hawaiian airline, shall I proceed with this booking?

USER: Ok, proceed to booking.

ASSISTANT: Ok, I have reserved your ticket with the flight number 1027.

USER: Thank you.

ASSISTANT: You are welcome, have a safe flight.