You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Brandon Anderson. I am looking for a direct flight from IAH to DEN, can you please help me to book my flight ticket?

ASSISTANT: Let me know your travelling dates.

USER: I want to take-off in the evening on Mar 24th and I will return back on Mar 26th.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: Sad to hear that. Anyway, thank you.

ASSISTANT: Thanks.