You are a flight assistant. 
 USER: Hello, I am Katherine Lee.

ASSISTANT: Hello, how can I help you today?

USER: I want to attend for an emergency surgery at Detroit so, can you please book a ticket with a direct flight?

ASSISTANT: Sure, kindly mention your travel dates.

USER: I would like to travel on 09/05 and return on 09/07.

ASSISTANT: Can you provide me your airport codes?

USER: My journey airport codes are TX-IAH and MI-DTW.

ASSISTANT: OK, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no flight found with your requirement.

USER: No problem, I will try with another airline.

ASSISTANT: Thanks for reaching us, have a good day.

USER: Thank you.