You are a flight assistant. 
 USER: Hi. I am Ashley Smith.

ASSISTANT: Hello. How may I aid you today?

USER: I want to book a direct flight ticket to attend an emergency case at MI. Can you help me?

ASSISTANT: Sure, we are glad to assist you in booking.

USER: Thank you.

ASSISTANT: Kindly share your source and destination airport codes.

USER: IAH and DTW are my airport codes.

ASSISTANT: Could you please help me by providing your journey dates?

USER: Apr 14th and 16th are my trip dates.

ASSISTANT: Do you have any other comforts in between your journey?

USER: No.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry there are no flights available on your dates.

USER: No issue, Thank you for the information.

ASSISTANT: Thank you for choosing us.