You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Betty Clark.

ASSISTANT: How can I provide service to you?

USER: Can you book a direct flight for me from IAD to DEN?

ASSISTANT: Sure, Please forward your journey dates?

USER: My journey dates are from 06/24 to 06/26.

ASSISTANT: How much you can pay for this ticket?

USER: I can pay upto 500.

ASSISTANT: Please give me a moment. I will revert you.

USER: Ok.

ASSISTANT: Thanks for your time. There are no flights found with your  requirements.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.

ASSISTANT: Have a pleasant day.