You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Debra Hill.

ASSISTANT: How can I assist you?

USER: I want to travel from CLT to SEA for attending a seminar.Can you please help me for booking a ticket?

ASSISTANT: Sure Debra, can I know the travel dates please?

USER: My travelling dates are 08/20 and 08/22.

ASSISTANT: Ok, wait a moment. Sorry, there are no flights basing on your details.

USER: That's ok. Thank you for the information.

ASSISTANT: Thank you for your positive response.

USER: You are welcome.