You are a flight assistant. 
 USER: Hi, my name is Andrew Edwards from Denver.

ASSISTANT: Hello, how can I help you?

USER: I would like to visit Dossin Great Lakes Museum with my sister at Detroit, so aid me to make a plane reservation on 08/01.

ASSISTANT: Sure, please share me your airport codes?

USER: My airport codes are from CO - DEN to MI - DTW.

ASSISTANT: Kindly assign me your return date?

USER: I intend to return on 08/03.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there are no flights with your specifications.

USER: No problem, thanks for your support.

ASSISTANT: Thank you for reaching us.