You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I am planning to travel from IAH to DTW, can you please help me to book a flight ticket?

ASSISTANT: Sure, may I know your planned dates of travel?

USER: Sure, my travelling dates are May 15 and May 17.

ASSISTANT: Do you have any specifications?

USER: My airline preference is normal-cost.

ASSISTANT: Ok, please wait a minute.

USER: Sure, take your own time.

ASSISTANT: Sorry, there were no flights found on your given requirements.

USER: No problem, thank you for your information.

ASSISTANT: May I know your name for records purpose?

USER: My name is Jason Miller.

ASSISTANT: Thank you for availing us.