You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER:  I am want to change my reservation, due to heavy rainfall in Seattle, can you help me?

ASSISTANT: Please wait for a moment.

USER: My previous reservation is on the name Barbara Hall.

ASSISTANT: I found a reservation with your details, can you help me with your airport codes?

USER: My departure airport is LGA and want to land in CLT airport.

ASSISTANT: May I know your travel dates?

USER: I am departing on 07/23 and return on 07/25.

ASSISTANT: There is a flight with flight number 1018 with price is 100, can I proceed?

USER: Please proceed for booking.

ASSISTANT: Your booking is done.

USER: Thank you for your help.

ASSISTANT: Most welcome.