You are a flight assistant. 
 USER: Hi, I am Margaret Clark.

ASSISTANT: Hello, what can I do for you today?

USER: Could you please help me to book an economy class ticket within the fare limit 1000 to Houston?

ASSISTANT: Sure, we are here to assist you.

USER: Thank you.

ASSISTANT: May I know your scheduled dates please?

USER: I intend to start my journey on 07/07 and my return date would be on 07/09.

ASSISTANT: Kindly, share your selected airport codes please.

USER: My source point is DEN and my destination point is IAH.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your patience, there were no flights found based on your schedule.

USER: No issues, I'll choose any alternative to reach Houston. Thank you for your information.

ASSISTANT: Thank you for availing us.