You are a flight assistant. 
 USER: Hello. Ronald Rodriguez here.

ASSISTANT: Hello, how may I help you?

USER: I am planning to travel from IAH to DTW. Could you please help me to book a ticket?

ASSISTANT: Sure, can I know your travelling dates?

USER: My travelling dates will be on 09/04 to 09/06.

ASSISTANT: Please hold on a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on given schedule.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.