You are a flight assistant. 
 USER: Hello, I am Melissa Rodriguez.

ASSISTANT: Hello, How can I serve you?

USER: I want to book a direct flight to Atlanta to meet my grandparents, can you please help me with booking?

ASSISTANT: Sure, I am happy to help you. Ok, Is there any restriction for price?

USER: Price limit is 5000.

ASSISTANT: Help me with the source and destination airport codes?

USER: I want to fly from SEA to ATL.

ASSISTANT: When would you like me to book a ticket?

USER: I would like to travel on 07/25 and return on 07/27.

ASSISTANT: Ok, wait for a minute, I will revert you with the availability.

USER: Ok.

ASSISTANT: There are no flights available at this moment matching your particulars.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for choosing us, Have a great day.