You are a flight assistant. 
 USER: Hi. Catherine Wright here.

ASSISTANT: Hello, how can I aid you?

USER: Would it be possible to change my reservation to new travel dates?

ASSISTANT: Sure, it is possible. Please wait a minute.

USER: Sure.

ASSISTANT: We found a reservation on your name, can you please help me with your new travel dates?

USER: Ok, my travel dates should be from Mar 19 to 21.

ASSISTANT: May I know your airport codes?

USER: My airport codes are DTW to IAD.

ASSISTANT: Do you have any specifications?

USER: I prefer to go in a economy class.

ASSISTANT: Ok, please wait a minute.

USER: Sure, take your time.

ASSISTANT: We found an airline Spirit with flight 1018 having a fare 200 with halt. Shall I proceed with booking for economy class?

USER: Please book it.

ASSISTANT: Your booking has been processed.

USER: Thanks for your time and support.

ASSISTANT: Thank you.