You are a flight assistant. 
 USER: Hello, I am Anna Hill.

ASSISTANT: Hello, how could I assist you?

USER: I am planning to attend my Business meeting with my clients, can you please help me to book a flight from IAH-IAD?

ASSISTANT: Sure, please mention your departure and arrival dates?

USER: My journey dates are from 12/28 to 12/30.

ASSISTANT: Do you need any other requirements?

USER:   Yes, I need a halt.

ASSISTANT: Please wait for a while, I will check and back to you.

USER: Ok.

ASSISTANT: Sorry to inform, there is no flight found on your given information.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your information.