You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Can you help me to book a flight ticket from IAH to DTW?

ASSISTANT: Sure, I am here to help you with that. Can I know your planned trip dates?

USER: Thank you for your positive response. I planned my journey on the dates Nov 22 and Nov 24.

ASSISTANT: Ok, may I know your good name?

USER: Sure, myself Michelle Johnson.

ASSISTANT: Do you have any other requirements?

USER: Yes, I am looking for a connecting flight and make sure to check with the evening flight at the time of take off.

ASSISTANT: Ok, wait for a minute.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to say that, there are no flights available based on your travelling dates.

USER: Oh! so sad to hear that from you. I will try with other agency. Anyway thank you for checking.

ASSISTANT: Thank you for approaching us.