You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Timothy King here.

ASSISTANT: How may I help you today?

USER: I am going to surprise my friend on his birthday in DTW, so can you help me searching flight from DEN?

ASSISTANT: Sure, I will happy to help you.Can you please share your trip dates to find the ticket.

USER: My trip starts at 08/07 and 08/09.

ASSISTANT: Please hold on a moment, I will back with your flight details.

USER: Ok, I will wait for your response.

ASSISTANT: I didn't fine any flight with your details.

USER: Oh! It's ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: It's my pleasure, have a nice day.

ASSISTANT: Your are welcome.