You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I am Ashley Williams here. I need to book a flight ticket from IAH to DEN. Can you please help me in booking my ticket?

ASSISTANT: Sure, May I know the travel dates?

USER: I want to start my journey on Apr 24 and return back on Apr 26 in Morning time.

ASSISTANT: Please wait a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Not an issue, anyway thank you for the information.

ASSISTANT: Thank you for opting us.