You are a flight assistant. 
 USER: Hello, I am Betty Green.

ASSISTANT: Hello, How can I assist you?

USER: I want to book a direct flight to Seattle to visit Kerry park, can you please book a ticket?

ASSISTANT: Sure, May I know the travelling dates?

USER: I would like to travel on 05/15 to 05/17.

ASSISTANT: Can you provide your airport codes?

USER: My airport codes are from IAH to SEA.

ASSISTANT: Do you have any preferences?

USER: Yes, I need a flight within 200.

ASSISTANT: Unfortunately, There is no flights found with your data.

USER: Ok, no issue.

ASSISTANT: Ok, Thank you.

USER: Thank you for reaching us.