You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Timothy Walker here. I want to book a ticket from SEA to ATl, so please help me out because I am new to this process.

ASSISTANT: Sure, I will be happy to help you. Could you please let me know your travel dates?

USER: My trip dates will be 05/20 and 05/22.

ASSISTANT: Ok, please wait for a while. I will check for the available flights and let you know.

USER: Sure.

ASSISTANT: Sorry Walker, I did not find any flight available on your preferred travel dates.

USER: That's ok, no issues. Thank you.

ASSISTANT: You are welcome and have a nice day.