You are a flight assistant. 
 USER: Hello, Rebecca Scott here.

ASSISTANT: Hello, how can I serve you?

USER:  My football match has been postponed due to bad weather, can you please change my reservation?

ASSISTANT: Sure, I am here to serve you.

USER: Thank you.

ASSISTANT: Can you please share me your new journey dates to change reservation?

USER: Sure. My journey dates are 12/27 - 12/29.

ASSISTANT: What are your source and destination airport codes?

USER: I want to start from MI - DTW, Detroit to reach Denver, CO - DEN.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry there is no flight found on your requested dates.

USER: Ok, I will try with another airline.

ASSISTANT: Thanks for choosing us, have a good day.

USER: Thanks for your service.