You are a flight assistant. 
 USER: Hi. I am Betty Baker.

ASSISTANT: Hello, how best I can help you today?

USER: Book a flight from DTW to IAH under 5000 fare.

ASSISTANT: Sure. Can you please forward your journey dates?

USER: Sure, my journey dates are 10/17 to 10/19.

ASSISTANT: Thank you for sharing your details. Please wait for a while.

USER: OK.

ASSISTANT: Thank you  for waiting. Sorry we did not find any flights matching your credentials.

USER: Ok, no problem at all.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your response.

ASSISTANT: Have a nice day.