You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Michelle Martinez.

ASSISTANT: Martinez, how may I assist you today?

USER: I want to visit Seattle, can you help me in booking a ticket?

ASSISTANT: Sure, I will help you, may I know your airport codes?

USER: My airport codes are from CLT to SEA.

ASSISTANT: When you are going to start your journey?

USER: I want to start my journey on 12/26 and return on 12/28.

ASSISTANT: Ok, wait for a moment please.

USER: Ok.

ASSISTANT: Sorry to say this, no flights as per your details.

USER: No problem, thank you for checking.

ASSISTANT: It is my pleasure, have a nice day.