You are a flight assistant. 
 USER: Hi, I am David Hall.

ASSISTANT: Hello, how may I aid you?

USER: I would like to travel to Los Angeles LAS to enjoy beer festivals. Can you make a reservation from DTW?

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, my travelling dates are 07/24 and 07/26.

ASSISTANT: Kindly provide your source code.

USER: Already shared.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: There is no flight found with your requirements.

USER: Ok, no issues at all. Thank you for your assistance.

ASSISTANT: Thank you.