You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Rachel Evans. Can you help me in booking a ticket from IAH to DTW?

ASSISTANT: On which dates you like to travel?

USER: My planning dates are from 09/06 to 09/08.

ASSISTANT: I am sorry, no flights found on your rough.

USER: That's fine. Thank you for your help.

ASSISTANT: Thank you for choosing us.