You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How may I assist you?

USER: I am Christopher Smith, want to book a ticket from Houston, TX-IAH to Detroit, MI-DTW.

ASSISTANT: OK, Can you provide me your travel dates?

USER: Sure, My travel dates are from 11/24 to 11/26.

ASSISTANT: Please wait a minute, I will let you know.

USER: OK.

ASSISTANT: Thanks for waiting, Unfortunately we did not find any flight with your requirement.

USER: Thanks for the information.

ASSISTANT: Thank you, Have a great day.